Document:

<PAGE>
                                                                     Exhibit 4.1

NUMBER                                                                   SHARES
CA

                                 [CYNOSURE LOGO]

                                 CYNOSURE, INC.

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

                                                            CLASS A COMMON STOCK

                                                               CUSIP 232577 20 5
                                        SEE REVERSE SIDE FOR CERTAIN DEFINITIONS

THIS CERTIFIES THAT

IS THE OWNER OF

  FULLY PAID AND NON-ASSESSABLE SHARES OF CLASS A COMMON STOCK OF THE PAR VALUE
                                OF $0.01 EACH, OF

                                 CYNOSURE, INC.

transferable on the books of the Corporation by the holder hereof, in person or
by duly authorized attorney, upon surrender of this Certificate properly
endorsed. This Certificate is not valid until countersigned and registered by
the Transfer Agent and Registrar.
      Witness the facsimile seal of the Corporation and facsimile signatures of
its duly authorized officers.

Dated:

/s/ Michael R. Davin                        [Seal]  /s/ Timothy W. Baker
President, Chief Executive Officer and              Executive Vice President and
Chairman of the Board of Directors                  Chief Financial Officer

COUNTERSIGNED AND REGISTERED:

AMERICAN STOCK TRANSFER & TRUST COMPANY

Transfer Agent and Registrar

By:________________________________________
     Authorized Signature

<PAGE>

                                 CYNOSURE, INC.

      THE CORPORATION IS AUTHORIZED TO ISSUE MORE THAN ONE CLASS OF STOCK. THE
CORPORATION WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO REQUESTS THE
POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING, OPTIONAL OR OTHER
SPECIAL RIGHTS OF EACH CLASS OF STOCK OR SERIES THEREOF AND THE QUALIFICATIONS,
LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND/OR RIGHTS.

         The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

<Table>
<S>        <C>                                   <C>                        <C>
TEN COM    -  as tenants in common               UNIF GIFT MIN ACT  -       ________________ Custodian _________________
                                                                                  (Cust)                   (Minor)

TEN ENT    -  as tenants by the entireties                                  under Uniform Gifts to Minors Act __________
                                                                                                              (State)

JT TEN     -  as joint tenants with right of
              survivorship and not as            UNIF TRF MIN ACT  -        ________________ Custodian (until age_______)
              tenants in common                                                   (Cust)                   (Minor)

TOD        -  transfer on death direction in                                under Uniform Transfers to Minors Act ______
              event of owner's death, to                                                                         (State)
              person named on face and
              subject to TOD rules
              referenced.
</TABLE>

     Additional abbreviations may also be used though not in the above list.

FOR VALUE RECEIVED, _________________________ hereby sell, assign and transfer
unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
   IDENTIFYING NUMBER OF ASSIGNEE

______________________________________

________________________________________________________________________________
  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

________________________________________________________________________________

________________________________________________________________________________

_________________________________________________________________________Shares

of the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint ______________________ Attorney to transfer
the said stock on the books of the within named Corporation with full power of
substitution in the premises.

Dated ____________________                      ________________________________

                                                ________________________________

                       NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT MUST
                               CORRESPOND WITH THE NAME(S) AS WRITTEN UPON
                               THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR,
                               WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE
                               WHATEVER.

Signature(s) Guaranteed:

By _______________________________

THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS,
STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN
AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE
17Ad-15.<PAGE>
                                                                   Exhibit 10.11

                                 CYNOSURE, INC.
                                 5 CARLISLE ROAD
                          WESTFORD, MASSACHUSETTS 01886

                                         [______], 2005

El.En. S.p.A.
Via Baldanzese, 17
50041 Calenzano
Firenze - Italy

     Re:  Reimbursement Agreement

Ladies and Gentlemen:

     Reference is made to that certain Underwriting Agreement (the "Underwriting
Agreement"), dated the date hereof, among Cynosure, Inc., a Delaware corporation
(the "Company"), El.En. S.p.A., an Italian corporation ("El.En."), and each of
Citigroup Global Markets Inc., UBS Securities LLC, Jefferies & Company, Inc. and
Needham & Company, LLC as representatives of a group of Underwriters named
therein (the "Underwriters"), relating to an underwritten public offering of
Class A Common Stock, $0.001 par value per share, of the Company. Capitalized
terms used but not otherwise defined herein shall have the respective meanings
ascribed to such terms in the Underwriting Agreement.

     This letter serves to confirm the agreement between the Company and El.En.
that:

     (a) in the event that either the Company or El.En. receives notice pursuant
to Section 8(c) of the Underwriting Agreement of a claim for indemnification,
such party will promptly notify the other party of such claim;

     (b) in all actions for which indemnification is sought pursuant to Section
8(a) of the Underwriting Agreement, the Company shall be entitled to exercise
all rights as the "indemnifying party" under and pursuant to Section 8(d) of the
Underwriting Agreement with respect thereto, including, without limitation,
assuming the defense of any such action, provided, however, that if El.En.
reasonably believes in good faith that the Company's assumption of the defense
of any such action would materially compromise its rights, remedies or defenses,
El. En. shall be entitled to retain its own counsel to participate in (but not
control) such defense, and the Company shall bear all reasonable fees and costs
incurred by El. En. in connection with such separate representation and shall
promptly reimburse El. En. for such fees and costs from time to time upon
presentation of El. En.'s written demand and, provided further, that El.En. will
not, without the prior written consent of the Company, which consent shall not
be unreasonably withheld, settle or compromise or consent to the entry of
judgment with respect to any pending or threatened claim, action, suit or
proceeding in respect of which indemnification or contribution is sought under
the Underwriting Agreement; and

     (c) subject to El.En.'s compliance with paragraphs (a) and (b) above, in
the event and to the extent (i) El.En. or any of its officers, directors,
employees or agents (each an "El.En. Indemnified Party") is required to make any
indemnity payments to the Underwriters pursuant to
<PAGE>
El.En. S.p.A.
[______], 2005
Page 2 of 3

Section 8 of the Underwriting Agreement, and (ii) such indemnity payments relate
to matters as to which El.En., at the date hereof, had no knowledge after
reasonable inquiry, the Company will promptly reimburse such El.En. Indemnified
Party for such indemnity payments actually paid to the Underwriters. For
purposes hereof, "knowledge" shall mean the conscious awareness of any director
or officer of El.En., and "reasonable inquiry" shall mean inquiry by executives
of El. En. of the Company's Chief Executive Officer, Chief Financial Officer,
Executive Vice President, Sales and Chief Operating Officer as to the
truthfulness of any statement of a material fact contained in the Registration
Statement or in any amendment thereof, or in any Preliminary Prospectus or the
Prospectus, or in any amendment thereof or supplement thereto, or as to the
inclusion of all material facts required to be stated therein or necessary to
make the statements therein not misleading.

     The Company and El.En. agree, understand and acknowledge that this letter
agreement is solely between the Company and El.En. and does not affect the
respective or collective obligations of the Company and El.En. to the
Underwriters pursuant to the Underwriting Agreement or limit the rights of the
Underwriters thereunder. Any failure by either party hereto at any time or from
time to time to enforce and require the strict keeping and performance of any of
the terms and conditions of this letter agreement shall not constitute a waiver
of any such terms and conditions at any future time and shall not permit such
party from insisting on the strict keeping and performance of such terms and
conditions at any later time.

     This letter agreement will be governed by and construed in accordance with
the laws of the State of New York applicable to contracts made and to be
performed within the State of New York. Any controversy or claim arising out of
or relating to this Agreement, or the breach, interpretation or enforcement
thereof, shall be settled by binding arbitration administered by the
International Center for Dispute Resolution ("ICDR") under its International
Arbitration Rules (the "Rules") and the Expedited Procedures. The case shall be
submitted to three (3) arbitrators selected in accordance with the Rules. The
place of the arbitration shall be New York, New York. The language of the
arbitration shall be English. Interim or provisional relief, including but not
limited to preliminary injunctions and attachments, may be granted in aid of
arbitration by any court having jurisdiction thereof. The parties waive any
right to review of the merits of the arbitrators' award.

     This letter agreement (i) may be signed in one or more counterparts, each
of which shall constitute an original and all of which together shall constitute
one and the same agreement and (ii) may be executed by facsimile signatures.

                                        Very truly yours,

                                        CYNOSURE, INC.

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------
<PAGE>
El.En. S.p.A.
[______], 2005
Page 3 of 3

Accepted and agreed:

EL.EN. S.P.A.

By:
    ---------------------------------
Name:
      -------------------------------
Title:
       ------------------------------

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