Professional Services Agreement


     This Professional Services Agreement (this "Agreement") is made as of April
7, 2004, by and among Bear Stearns  Merchant Manager II, LLC, a Delaware limited
liability  company  ("BSMB"),  AC Safety Holding  Corp., a Delaware  corporation
("Holding"),   and  AC  Safety   Acquisition   Corp.,  a  Delaware   corporation
("Acquisition"),  and Aearo Company I, a Delaware corporation ("Aearo Company").
Certain capitalized terms used herein are defined in Section 9 below.

     WHEREAS,   Aearo  Corporation,   a  Delaware  corporation  (the  "Surviving
Corporation"),  Holding and  Acquisition are parties to an Agreement and Plan of
Merger, dated as of March 10, 2004 (the "Merger Agreement"),  pursuant to which,
among  other  things,  Acquisition  will  merge  with  and  into  the  Surviving
Corporation (the "Merger"); and

     WHEREAS,  Holding  and,  on behalf of itself,  the  Surviving  Corporation,
Acquisition and Aearo Company desire to retain BSMB with respect to the services
described herein.

     NOW, THEREFORE, the parties agree as follows:

1.   Term.  This Agreement shall commence on the date hereof and shall terminate
     (except as provided in the immediately  following sentence) on the earliest
     to occur of (a) the consummation of a Qualified  Public  Offering,  (b) the
     consummation of a Realization  Event,  (c) termination by BSMB upon 30 days
     written  notice  to  Acquisition  (or,  after  the  Merger,  the  Surviving
     Corporation) and (d) the tenth anniversary of the date hereof (the "Term");
     provided,  however,  that if no Qualified  Public  Offering or  Realization
     Event has been consummated prior to the tenth  anniversary,  the Term shall
     be  automatically  extended  thereafter  on a year to year basis unless (i)
     Acquisition  (or,  after the Merger,  the Surviving  Corporation)  provides
     written  notice to BSMB of its desire to terminate  this  Agreement or (ii)
     BSMB provides written notice to Acquisition  (or, after the Merger,  to the
     Surviving  Corporation) of its desire to terminate this Agreement,  in each
     case, 30 days prior to the expiration of the Term or any extension thereof;
     or at such time as a  Qualified  Public  Offering or  Realization  Event is
     consummated.  The provisions of Sections  3(e),  3(g), 6, 7, 8, 10, 11, 12,
     13, 14 and 15 and obligations to pay any outstanding  unpaid fees hereunder
     and  accrued  interest  thereon  shall  survive  the  termination  of  this
     Agreement.

2.   Services.  BSMB shall  perform or cause to be performed  such  services for
     Holding, Acquisition (and, after the Merger, the Surviving Corporation) and
     their   respective   subsidiaries   as  mutually  agreed  by  Holding's  or
     Acquisition's (and, after the Merger, the Surviving Corporation's) board of
     directors,  as the  case  may be  and  BSMB,  which  may  include,  without
     limitation, the following:

     (a)  general advisory and management services;

     (b)  business development  functions,  including  identification,  support,
          negotiation and analysis of acquisitions  and dispositions by Holding,
          Acquisition  (and,  after the Merger,  the Surviving  Corporation) and
          their respective subsidiaries;

     (c)  support,   negotiation   and  analysis  of   financing   alternatives,
          including,   without  limitation,  in  connection  with  acquisitions,
          capital expenditures and refinancing of existing indebtedness;

     (d)  finance  functions,   including   assistance  in  the  preparation  of
          financial  projections,  and  monitoring of compliance  with financing
          agreements;

     (e)  marketing  functions,  including  monitoring  of  marketing  plans and
          strategies;

     (f)  human resource functions, including searching,  identifying and hiring
          of executives and directors; and

     (g)  other services for Holding,  Acquisition  (and, after the Merger,  the
          Surviving  Corporation) and their respective  subsidiaries  upon which
          Holding's  or  Acquisition's  (and,  after the Merger,  the  Surviving
          Corporation's) board of directors, as the case may be, and BSMB agree.


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3.   Advisory Fee.

     (a)  In  consideration of BSMB's  undertaking to provide advisory  services
          hereunder,   Acquisition   (and,  after  the  Merger,   the  Surviving
          Corporation)  or Aearo Company  shall pay BSMB an annual  advisory fee
          (the "Advisory Fee") in an aggregate amount for each fiscal year equal
          to  the  greater  of (i)  $700,000  and  (ii)  1.25%  of the  Adjusted
          Consolidated  EBITDA (as  hereinafter  defined)  for such fiscal year,
          calculated  as  provided  below and  payable in  arrears in  quarterly
          installments (based on twelve 30-day months), for the period beginning
          on the date hereof and ending upon the  termination  of this Agreement
          as provided in Section 1 hereof. The Advisory Fees shall be payable by
          Acquisition (or, after the Merger, the Surviving  Corporation) whether
          or not Acquisition (or, after the Merger,  the Surviving  Corporation)
          actually requests that BSMB provide the services  described in Section
          2 above.

     (b)  Except as otherwise provided in Section 3(d), 3(e) or 3(f) hereof, (i)
          the first installment of the Advisory Fee, for the period beginning on
          the date hereof and ending June 30, 2004, shall be payable on June 30,
          2004  (unless  otherwise  directed  by  BSMB)  in an  amount  equal to
          $175,000  multiplied  by a fraction (A) the  numerator of which is the
          actual  number  of days  from and  including  the date  hereof  to and
          including  June 30, 2004 and (B) the  denominator  of which is 90, and
          (ii) the  second  installment  of the  Advisory  Fee,  for the  period
          beginning on July 1, 2004 and ending on September  30, 2004,  shall be
          payable on September 30, 2004 (unless  otherwise  directed by BSMB) in
          an amount equal to $175,000.

     (c)  Except as otherwise provided in Section 3(d), 3(e) or 3(f) hereof, all
          subsequent  payments  of  the  Advisory  Fee  shall  be  in  quarterly
          installments,  payable in arrears on March 31, June 30,  September  30
          and December 31 of each year, in an amount equal to the greater of (i)
          $175,000 and (ii) 0.3125% of the Adjusted  Consolidated EBITDA for the
          preceding  fiscal year,  based on the audited  consolidated  financial
          statements of Holding and its  subsidiaries  for such preceding fiscal
          year.

     (d)  Promptly upon receipt of its audited consolidated financial statements
          for each fiscal year (commencing with the fiscal year ending September
          30, 2004),  Holding will certify the Adjusted  Consolidated EBITDA for
          the preceding fiscal year to BSMB.

          (i)  To the extent that the aggregate installments of the Advisory Fee
               paid to BSMB with  respect to such  preceding  fiscal year exceed
               the  greater  of (a)  $700,000  and  (b)  1.25%  of the  Adjusted
               Consolidated   EBITDA  for  the  preceding   fiscal  year,   then
               Acquisition (or, after the Merger, the Surviving Corporation) may
               set off the  amount  of such  excess  (the  "Excess  -------  Fee
               Amount")  against their obligation to pay the next installment of
               the Advisory  Fee  ----------  (and  subsequent  installments  as
               needed to recover  such  Excess  Fee  Amount in full);  provided,
               however, that for the fiscal year ending September 30, 2004, only
               the  excess  --------  -------  of  the  sum  of  the  first  two
               installments of the Advisory Fee that exceed the product of (x) a
               fraction (i) the  numerator of which is the actual number of days
               from and including the date hereof to and including September 30,
               2004 and  (ii) the  denominator  of which is 180  (such  fraction
               hereinafter   the   "Initial   Period   Fraction"),    multiplied
               -----------------------  -----------  by (y) the  greater  of (i)
               $350,000 and (ii) 0.625% of the Adjusted  Consolidated  EBITDA --
               for the fiscal year ending  September 30, 2004 shall be deemed to
               be an Excess Fee Amount for  purposes  of this  Section  3(d)(i).
               ---------------

          (ii) To the extent that the aggregate installments of the Advisory Fee
               paid to BSMB with respect to such preceding  fiscal year are less
               than the greater of (a)  $700,000  and (b) 1.25% of the  Adjusted
               Consolidated   EBITDA  for  the  preceding   fiscal  year,   then
               Acquisition  (or,  after the Merger,  the Surviving  Corporation)
               shall pay BSMB the amount of such deficiency at such time as they
               are  obligated to pay the next  installment  of the Advisory Fee;
               provided,  however, that for the fiscal year ending September 30,
               2004,  --------  -------  Acquisition  shall  only make a payment
               pursuant to this Section 3(d)(ii) to the extent -----------------
               that the product of (x) the Initial Period Fraction multiplied by
               (y) the greater of -------------- (i) $350,000 and (ii) 0.625% of
               the  Adjusted  Consolidated  EBITDA  for the fiscal  year  ending
               September 30, 2004 exceeds the sum of the first two  installments
               of the Advisory Fee.

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     (e)  Upon the consummation of a Qualified Public Offering, Acquisition (or,
          after the Merger, the Surviving Corporation) or Aearo Company shall be
          obligated to pay to BSMB an amount equal to (i) any accrued but unpaid
          Advisory  Fee  for the  period  during  which  such  Qualified  Public
          Offering  is  consummated,  plus (ii) the  Advisory  Fee that would be
          payable to BSMB pursuant to this Section 3 in respect of the next four
          successive  three-month  periods  calculated based on the Advisory Fee
          paid or payable for the then current three-month period.


     (f)  Notwithstanding anything to the contrary contained herein, Acquisition
          (or,  after the Merger,  the Surviving  Corporation)  or Aearo Company
          shall  accrue but not pay the  Advisory  Fee if and for so long as (i)
          any such payment would constitute a default (or any event which might,
          with the lapse of time or the giving of notice or both,  constitute  a
          default) under Holding's and Acquisition's  (or, after the Merger, the
          Surviving Corporation's) financing agreements (a "Default"); provided,
          however,  that  Acquisition  (or,  after  the  Merger,  the  Surviving
          Corporation)  or Aearo  Company  shall be obligated to pay any accrued
          Advisory Fees deferred  under this Section  3(f)(i) to the extent that
          such payment  would not  constitute  a Default or (ii) BSMB  instructs
          Acquisition  (or,  after the Merger,  the Surviving  Corporation)  and
          Aearo Company not to pay all or any portion of the Advisory Fee during
          any fiscal year.  Interest will accrue on all due and unpaid  Advisory
          Fees not paid pursuant to clause (i) of the preceding  sentence at the
          Default  Rate until such  Advisory  Fees are paid,  and such  interest
          shall  compound  annually.  The "Default Rate" shall be LIBOR (as such
          term is defined in the Senior Facility) plus 4.25% per annum.

     (g)  In addition to the Advisory Fee,  Acquisition (on behalf of itself and
          the Surviving  Corporation)  or Aearo Company  shall  reimburse  BSMB,
          promptly  upon  request,  for all  reasonable  out-of-pocket  expenses
          incurred  by BSMB in  connection  with BSMB's  obligations  hereunder,
          including,  but  not  limited  to,  the  fees  and  expenses  paid  to
          consultants, subcontractors and other third parties in connection with
          such obligations.

4.   Transaction Fees.

     (a)  Acquisition  (on behalf of itself and the  Surviving  Corporation)  or
          Aearo Company  hereby agrees to pay to BSMB upon the date hereof a fee
          (the "Closing Fee") for services rendered in connection with securing,
          structuring  and  negotiating   the   acquisition,   equity  and  debt
          financing,  including but not limited to the Senior Facility, a bridge
          loan and a high-yield  offering for the  transactions  contemplated by
          the Merger  Agreement and certain  other  management  services,  in an
          amount equal to  $6,000,000.  The Closing Fee shall be payable by wire
          transfer of immediately  available funds to BSMB or one or more of its
          designees.

     (b)  If  Holding  or  Acquisition  (or,  after the  Merger,  the  Surviving
          Corporation)  shall determine that it is advisable to hire a financial
          advisor,  consultant,  investment  banker  or  any  similar  agent  in
          connection  with any  transaction  (other  than a  Realization  Event)
          relating  to (i) an  acquisition,  divestiture,  or other  transaction
          (whether by merger,  recapitalization or otherwise),  (ii) issuance of
          securities (including,  without limitation, an initial public offering
          by  Holding  or any of its  subsidiaries)  or  (iii) a debt or  equity
          financing,  in each case, by or involving  Holding,  Acquisition  (or,
          after  the  Merger,  the  Surviving   Corporation)  or  any  of  their
          subsidiaries,  it shall promptly notify BSMB of such  determination in
          writing.  Promptly  thereafter,  upon the  request  of BSMB,  Holding,
          Acquisition (or, after the Merger, the Surviving  Corporation) or such
          subsidiary,  as the case may be, shall hire BSMB or its  Affiliates to
          act as a financial  advisor to  Holding,  Acquisition  (or,  after the
          Merger, the Surviving Corporation) or such subsidiary, as the case may
          be, on a non-exclusive  basis in connection with such transaction.  At
          the  closing  of any such  transaction,  BSMB  shall  receive a fee (a
          "Transaction  Fee")  the  amount  of which  shall be  agreed to by the
          parties in good faith prior to such closing.  In the event the parties
          are unable to agree to such fee, the Transaction Fee shall equal 1.00%
          of the  aggregate  enterprise  value  paid  or  provided  by  Holding,
          Acquisition (or, after the Merger, the Surviving Corporation), or such
          subsidiary,  as the case may be (including the aggregate  value of (x)
          equity securities,  warrants, rights and options acquired or retained,
          (y)  indebtedness  acquired,  assumed or refinanced  and (z) any other
          consideration   or   compensation   paid  in   connection   with  such
          transaction). In addition, Holding, Acquisition (or, after the Merger,
          the Surviving  Corporation)  or such  subsidiary,  as the case may be,
          shall  reimburse  BSMB,  promptly  upon  request,  for all  reasonable
          out-of-pocket  expenses  incurred  by BSMB in  connection  with BSMB's
          obligations hereunder in connection with such transaction,  including,
          but not  limited  to,  the  fees  and  expenses  paid to  consultants,
          subcontractors  and  other  third  parties  in  connection  with  such
          obligations.  BSMB may  assign  its rights  under  this  Section  4(b)
          generally or in connection with any actual or prospective  transaction
          to any of its affiliates or to any of The Bear Stearns  Companies Inc.
          and its subsidiaries.

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     (c)  If  Holding  or  Acquisition  (or,  after the  Merger,  the  Surviving
          Corporation)  shall determine that it is advisable to hire a financial
          advisor,  consultant,  investment  banker  or  any  similar  agent  in
          connection with a Realization  Event, it shall promptly notify BSMB of
          such determination in writing.  Promptly thereafter,  upon the request
          of BSMB,  Holding or Acquisition (or, after the Merger,  the Surviving
          Corporation), as the case may be, shall hire BSMB or its Affiliates to
          act as a financial  advisor to Holding or  Acquisition  (or, after the
          Merger,  the  Surviving  Corporation)  on  a  non-exclusive  basis  in
          connection with such  Realization  Event.  Upon the  consummation of a
          Realization  Event, BSMB shall be entitled to receive from Holdings or
          Acquisition (or, after the Merger, the Surviving Corporation) or Aearo
          Company,  as the case may be, a fee (a  "Company  Sale Fee")  equal to
          0.65% of the aggregate enterprise value paid to Holding or Acquisition
          (or, after the Merger, the Surviving Corporation), as the case may be,
          in connection  with such  Realization  Event  (including the aggregate
          value of (x) equity securities,  warrants, rights and options acquired
          or retained, (y) indebtedness acquired,  assumed or refinanced and (z)
          any other  consideration or compensation  paid in connection with such
          transaction).

5.   Personnel.  BSMB  shall  provide  and  devote  to the  performance  of this
     Agreement  such  partners,  employees and agents of BSMB as BSMB shall deem
     appropriate to the furnishing of the services required.

6.   Liability.  None  of  BSMB,  any of its  affiliates  nor  their  respective
     partners,  members,  employees or agents  (collectively,  the "BSMB Group")
     shall be liable to Holding, Acquisition, the Surviving Corporation or their
     subsidiaries  or  affiliates  for any loss,  liability,  damage or  expense
     (collectively,  a  "Loss")  arising  out  of or  in  connection  with  this
     Agreement or the performance of services contemplated hereunder (including,
     without  limitation,  the  performance  of  services  provided  pursuant to
     Section 4 above),  unless  and then  only to the  extent  that such Loss is
     determined  by a court in a final  order from which no appeal can be taken,
     to have  resulted  solely from the willful  misconduct  on the part of such
     member of the BSMB  Group.  BSMB makes no  representations  or  warranties,
     express or implied,  in respect of the  services to be provided by the BSMB
     Group.  Except as BSMB may otherwise  agree in writing on or after the date
     hereof:  (a) each  member of the BSMB  Group  shall  have the right to, and
     shall  have  no  duty  (contractual  or  otherwise)  not  to,  directly  or
     indirectly:  (i) engage in the same or similar business activities or lines
     of business as Holding,  Acquisition  (or, after the Merger,  the Surviving
     Corporation) or their respective subsidiaries and (ii) do business with any
     client,  customer,  supplier,  lender or  investor  of,  to or in  Holding,
     Acquisition  (or,  after the Merger,  the Surviving  Corporation)  or their
     respective subsidiaries; (b) no member of the BSMB Group shall be liable to
     Holding,  Acquisition (or, after the Merger, the Surviving  Corporation) or
     their  respective  subsidiaries  or  affiliates  for  breach  of  any  duty
     (contractual  or  otherwise)  by reason of any such  activities  or of such
     person's participation therein; and (c) in the event that any member of the
     BSMB Group acquires knowledge of a potential transaction or matter that may
     be a corporate opportunity for both (A) Holding, Acquisition (or, after the
     Merger, the Surviving Corporation) or their respective subsidiaries, on the
     one hand,  and (B) BSMB, on the other hand, or any other person,  no member
     of the BSMB  Group  shall  have  any duty  (contractual  or  otherwise)  to
     communicate or present such corporate  opportunity to Holding,  Acquisition
     (or,  after the Merger,  the  Surviving  Corporation)  or their  respective
     subsidiaries  and,  notwithstanding  any provision of this Agreement to the
     contrary,  shall not be  liable  to  Holding,  Acquisition  (or,  after the
     Merger, the Surviving Corporation), their respective subsidiaries or any of
     their  affiliates  for breach of any duty  (contractual  or  otherwise)  by
     reasons  of the  fact  that  any  member  of the  BSMB  Group  directly  or
     indirectly  pursues or acquires such  opportunity for itself,  directs such
     opportunity  to another  person,  or does not present such  opportunity  to
     Holding,  Acquisition  (or, after the Merger,  the Surviving  Corporation),
     their respective subsidiaries or any of their affiliates.  In no event will
     any of the  parties  hereto be liable to any  other  party  hereto  for any
     punitive,   exemplary,   indirect,  special,  incidental  or  consequential
     damages, including lost profits or savings, whether or not such damages are
     foreseeable,  or in respect of any liabilities  relating to any third party
     claims  (whether based in contract,  tort or otherwise)  other than for the
     Claims (as  defined in Section 7)  relating  to the  services  which may be
     provided by BSMB hereunder.

7.   Indemnity.  Holding,  Acquisition  (and,  after the Merger,  the  Surviving
     Corporation)  and  their  subsidiaries  shall  defend,  indemnify  and hold
     harmless  each member of the BSMB Group from and against any and all Losses
     arising from any claim by any person with respect to, or in any way related
     to, this Agreement  (including  attorneys' fees)  (collectively,  "Claims")
     resulting  from any act or omission of any member of the BSMB Group  except
     to the extent that such Loss is determined by a court in a final order from
     which no  appeal  can be taken to have  resulted  solely  from the  willful


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     misconduct  of such member of the BSMB Group.  Holding,  Acquisition  (and,
     after the Merger,  the Surviving  Corporation) and their subsidiaries shall
     defend at their own cost and expense any and all suits or actions  (just or
     unjust) which may be brought against  Holding,  Acquisition  (or, after the
     Merger, the Surviving  Corporation) and their subsidiaries or any member of
     the BSMB Group,  or in which any member of the BSMB Group may be  impleaded
     with others,  upon any Claims, or upon any matter,  directly or indirectly,
     related to or  arising  out of this  Agreement  or the  performance  of the
     obligations hereunder by the BSMB Group (including, without limitation, the
     performance of services  pursuant to Section 4 above),  except that if such
     damage shall be proven to be result solely from the willful misconduct by a
     member of the BSMB Group then such member of the BSMB Group shall reimburse
     Holding  and its  subsidiaries  for the costs of  defense  and other  costs
     incurred by Holding and its subsidiaries.  Notwithstanding  anything to the
     contrary contained in this Agreement, in no event will the liability of the
     BSMB Group in connection with this Agreement exceed the aggregate amount of
     all Advisory  Fees,  Closing Fees,  Transaction  Fees and Company Sale Fees
     paid to BSMB hereunder.

8.   Independent Contractor.  The parties acknowledge and agree that BSMB is and
     shall act as an  independent  contractor of Holding and  Acquisition  (and,
     after the Merger,  the Surviving  Corporation)  in the  performance  of its
     duties  hereunder.  BSMB is not, and in the  performance of its duties will
     not  hold  itself  out as,  an  employee,  agent  or  partner  of  Holding,
     Acquisition  (or, after the Merger,  the Surviving  Corporation)  or any of
     their respective subsidiaries.

9.   Notices.  All notices  hereunder shall be in writing and shall be delivered
     personally or mailed by United States mail,  postage prepaid,  addressed to
     the parties as follows:

     to   Acquisition  (and,  after the Merger,  the Surviving  Corporation)  or
     Aearo Company:

                  Aearo Corporation
                  Aearo Company I
                  5457 West 79th Street
                  Indianapolis, IN 46268
                  Attention:  Mr. Michael McLain
                  Tel: (317) 692-6557
                  Fax: (317) 692-6784


     with copies, which shall not constitute notice; to:

                  Bear Stearns Merchant Banking
                  c/o Bear, Stearns & Co. Inc.
                  383 Madison Avenue, 40th Floor
                  New York, New York 10179-5706
                  Attention: Mr. Douglas R. Korn
                  Tel.: 212-272-4154
                  Fax: 212-272-7425

     to Holding or BSMB:

                  Bear Stearns Merchant Manager II, LLC
                  c/o Bear, Stearns & Co. Inc.
                  383 Madison Avenue, 40th Floor
                  New York, New York 10179-5706
                  Attention: Mr. Douglas R. Korn
                  Tel.: 212-272-4154
                  Fax: 212-272-7425

     with a copy, which shall not constitute notice, to:

                  O'Melveny & Myers LLP
                  Times Square Tower
                  7 Times Square
                  New York, NY 10036
                  Attention: Adam Weinstein, Esq.
                  Tel.: (212) 408-2400
                  Fax: (212) 408-2420

10.  Certain  Definitions.  Capitalized  terms  used but not  otherwise  defined
     herein  shall  have  the  meaning  given  such  term  in the  Stockholders'
     Agreement  dated  as of the  date  hereof  by and  among  Holding  and  the
     stockholders  party thereto.  In addition,  for purposes of this Agreement,
     "Adjusted  Consolidated  EBITDA" means, with respect to any period, the sum
     of (i) Consolidated  EBITDA (as such term is defined in the Senior Facility
     on the date  hereof),  plus (ii) to the  extent  deducted  in  arriving  at


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     this Agreement and any fees paid to Vestar  Capital  Partners or any of its
     Affiliates,  in each of clauses  (i) and (ii) above,  during  such  period.
     "Senior  Facility"  means the Credit  Agreement dated as of the date hereof
     among  Holding,  the  Surviving  Corporation,  Aearo Company I, the Lenders
     thereunder,  Bear Stearns  Corporate  Lending,  as Syndication  Agent,  and
     Deutsche Bank Trust Company Americas, as Administrative Agent. "Realization
     Event"  shall  have  the  meaning  given  to such  term in the  2004  Stock
     Incentive Plan.

11.  Assignment.  Except as provided in Section 4(b), no party hereto may assign
     any  obligations  hereunder  to any other party  without the prior  written
     consent  of the other  parties  (which  consent  shall not be  unreasonably
     withheld); provided, however, that BSMB may, without the consent of Holding
     or Acquisition (or, after the Merger,  the Surviving  Corporation),  assign
     its rights under this Agreement to any of its affiliates.

12.  No Waiver.  The failure of a party to this  Agreement to insist upon strict
     adherence  to any  term of this  Agreement  on any  occasion  shall  not be
     considered a waiver or deprive that party of the right thereafter to insist
     upon strict adherence to that term or any other term of this Agreement. Any
     waiver must be in writing.

13.  Successors.  This Agreement and all the obligations and benefits  hereunder
     shall inure to the successors and permitted assigns of the parties.

14.  Counterparts.  This  Agreement  may be executed and delivered by each party
     hereto  in  separate  counterparts,  each of  which  when so  executed  and
     delivered shall be deemed an original and all of which taken together shall
     constitute but one and the same agreement.

15.  Entire  Agreement;  Modification;  Governing  Law. The terms and conditions
     hereof  constitute  the entire  agreement  between the parties  hereto with
     respect to the subject  matter of this Agreement and supersede all previous
     communications,  either oral or written,  representations  or warranties of
     any kind whatsoever, except as expressly set forth herein. No modifications
     of this  Agreement nor waiver of the terms or  conditions  thereof shall be
     binding  upon either  party  unless  approved  in writing by an  authorized
     representative of such party. All issues concerning this agreement shall be
     governed by and construed in  accordance  with the laws of the State of New
     York,  without  giving  effect  to any  choice  of law or  conflict  of law
     provision  or  rule  (whether  of the  State  of  New  York  or  any  other
     jurisdiction)   that  would  cause  the  application  of  the  law  of  any
     jurisdiction other than the State of New York.

16.  WAIVER OF JURY TRIAL.  EACH PARTY TO THIS AGREEMENT  HEREBY WAIVES,  TO THE
     FULLEST  EXTENT  PERMITTED BY LAW, ANY RIGHT TO TRIAL BY JURY OF ANY CLAIM,
     DEMAND,  ACTION, OR CAUSE OF ACTION (A) ARISING UNDER THIS AGREEMENT OR (B)
     IN ANY WAY  CONNECTED  WITH OR RELATED OR INCIDENTAL TO THE DEALINGS OF THE
     PARTIES  HERETO IN RESPECT  OF THIS  AGREEMENT  OR ANY OF THE  TRANSACTIONS
     RELATED HERETO, IN EACH CASE WHETHER NOW EXISTING OR HEREAFTER ARISING, AND
     WHETHER  IN  CONTRACT,  TORT,  EQUITY,  OR  OTHERWISE.  EACH  PARTY TO THIS
     AGREEMENT HEREBY AGREES AND CONSENTS THAT ANY SUCH CLAIM,  DEMAND,  ACTION,
     OR CAUSE OF ACTION SHALL BE DECIDED BY COURT TRIAL  WITHOUT A JURY AND THAT
     THE PARTIES TO THIS AGREEMENT MAY FILE AN ORIGINAL COUNTERPART OR A COPY OF
     THIS  AGREEMENT  WITH ANY COURT AS WRITTEN  EVIDENCE  OF THE CONSENT OF THE
     PARTIES HERETO TO THE WAIVER OF THEIR RIGHT TO TRIAL BY JURY.

                                    * * * * *

                                       6



     IN WITNESS WHEREOF,  the parties have executed this  Professional  Services
Agreement as of the date first written above.




                                        AC SAFETY HOLDING CORP.



                                        By:
                                        Name:
                                        Title:


     On behalf of itself and, after the Merger, Aearo Corporation, the Surviving
Corporation:

                                        AC SAFETY ACQUISITION CORP.



                                        By:
                                        Name:
                                        Title:


                                        AEARO Company I



                                        By:
                                        Name:  Michael A. McLain
                                        Title:  Chief Executive Officer and
                                                President


                                        BEAR STEARNS MERCHANT MANAGER II, LLC

                                        By:     JDH Management LLC, its Manager,



                                        By:
                                        Name:
                                        Title: