





                                                             EXHIBIT 99.4
                                                             ------------

                                  EXHIBIT F


                             MR. ESSAM KHASHOGGI
                        c/o E. Khashoggi Industries LLC
                        3916 State Street, Suite 110
                      Santa Barbara, California  93105


                                June 17, 2005

   ReNewable Products LLC
   100 South Brentwood Boulevard, Suite 200
   St. Louis, MO  63105
   Attention:  James A. Cooper

   EarthShell Corporation
   3916 State Street, Suite 110
   Santa Barbara, CA  93105

             Re:  EarthShell Corporation ("EarthShell")
                  -------------------------------------

   Gentlemen:

        Reference is made to the Agreement and Plan of Merger dated as of
   June 17, 2005 (the "Merger Agreement") among (i) EarthShell, (ii)
   EarthShell Triangle, Inc., a newly-formed, wholly-owned subsidiary of
   EarthShell ("Mergerco"), (iii) ReNewable Products, Inc. ("Target"), a
   wholly-owned subsidiary of ReNewable Products LLC ("Stockholder"), and
   (iv) Stockholder, pursuant to which EarthShell would acquire Target
   through the merger of Mergerco with and into Target, and Stockholder
   would receive, in exchange for all of the outstanding shares of
   Target, an aggregate of 8,000,000 shares of a new series of EarthShell
   preferred stock, designated Series C Convertible Preferred Stock.  The
   Series C Convertible Preferred Stock would be convertible into common
   stock, par value $.01 per share, of EarthShell ("EarthShell Common
   Stock") on a share-for-share basis (subject to certain adjustments).
   In connection with the closing under the Merger Agreement, EarthShell
   and Stockholder would enter into a Registration and Investor Rights
   Agreement in substantially the form previously provided to the
   undersigned.

        I, together with members of my family and entities I own or
   control (each of us, individually, a "Khashoggi Holder" and,
   collectively, the "Khashoggi Holders") currently own collectively
   approximately 6,526,838 shares of EarthShell Common Stock, as well as
   certain other securities of EarthShell, and one or more of the
   Khashoggi Holders are a party to various agreements with EarthShell
   relating to such securities, including a Registration Rights Agreement
   dated as of February 28, 1995, as amended.  The purpose of this letter
   is to set forth the agreements between us with respect to the possible
   disposition of our shares of EarthShell Common Stock.  For purposes of
   this letter, any securities convertible into, or exchangeable or







   exercisable for, shares of EarthShell Common Stock (including the
   Series C Convertible Preferred Stock) shall be treated as if they were
   the number of shares of EarthShell Common Stock into or for which they
   are convertible, exchangeable or exercisable.

        Stockholder agrees not to sell, distribute or otherwise dispose of
   ("Transfer") any shares of EarthShell Common Stock except (subject in
   all cases provided in clauses (i)-(vii) below to compliance with
   paragraph 4) (i) in a public offering registered under the Securities
   Act of 1933, as amended (the "Securities Act"), (ii) in a sale
   pursuant to Rule 144 under the Securities Act, (iii) to an affiliate
   of the Khashoggi Holders or Stockholder, as the case may be, who
   agrees in writing to be subject to the terms and conditions of this
   letter applicable to the transferor, (iv) in a private sale or sales
   involving in the aggregate fewer than 10% of the total number of
   shares of EarthShell Common Stock owned by the Khashoggi Holders (as a
   group) or Stockholder, as the case may be, as of the date of this
   letter, (v) in connection with a pledge of shares to secure a bona
   fide loan, (vi) upon the exercise of stock options or other rights
   outstanding as of the date of this letter or (vii) with the consent of
   the other party.  The restrictions in this paragraph 1 shall remain in
   effect from the date of this letter agreement until the earlier of (x)
   termination of the Merger Agreement and (y) the second anniversary of
   the closing under the Merger Agreement.  For purposes of this
   paragraph, "affiliate" shall have the meaning given such term in Rule
   405 under the Securities Act.

        2.   "CUT-BACK" RIGHTS IN REGISTERED OFFERINGS.  Notwithstanding
   the language of any registration rights agreement, or any other
   agreement between any Khashoggi Holder or Stockholder and EarthShell,
   if the managing underwriter or underwriters of any proposed
   underwritten offering in which any Khashoggi Holder and Stockholder
   request to include shares of EarthShell Common Stock advise that the
   number of shares sought to be included in the offering would exceed
   the number of shares of EarthShell Common Stock that could be sold
   without having an adverse effect on such offering, the number of
   shares requested to be included by any such Khashoggi Holder and
   Stockholder shall be reduced pro rata, based on the number of shares
   of EarthShell Common Stock that each party has requested to be
   included, regardless of whether either party demanded such
   registration or the relationship of the number of shares requested to
   be included by Stockholder to the number requested to be included by
   any Khashoggi Holder.

        3.   HOLD-BACK AGREEMENT.  Each Khashoggi Holder and Stockholder
   agrees not to effect any public sale or distribution (including sales
   pursuant to Rule 144 under the Securities Act) of EarthShell Common
   Stock, during the seven days prior to and the subsequent 120-day
   period beginning on the effective date of any registration statement
   in which shares of EarthShell Common Stock offered by the other are
   included (except sales or distributions made as part of such
   registration), unless both the other and the underwriters managing the
   offering otherwise agree.

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        4.   PRESERVATION OF NET OPERATING LOSS CARRYFORWARD.  Prior to
   making any Transfer of shares of EarthShell Common Stock, each
   transferring Khashoggi Holder and Stockholder agrees to coordinate
   with the other, EarthShell and their respective professional tax
   advisors regarding the effect that such Transfer, together with all
   past transactions and any future transactions that, in EarthShell's
   reasonable judgment, are likely to occur ("Foreseeable Transactions")
   involving EarthShell Common Stock, will have under Section 382 of the
   Internal Revenue Code of 1986, as amended, with respect to any net
   operating loss carryforward of EarthShell.  If there is a material
   risk that the proposed Transfer, together with all such past
   transactions and Foreseeable Transactions, would result in the
   disallowance of, or a material limitation on the availability of,
   EarthShell's net operating loss carryforward, then each such Khashoggi
   Holder and Stockholder agrees to reduce the number of shares of
   EarthShell Common Stock to be Transferred (pro rata based on the
   number of shares of EarthShell Common Stock proposed to be
   Transferred, or on such other basis as such Khashoggi Holder and
   Stockholder may agree) as reasonably necessary to avoid such risk.
   (Shares of EarthShell Common Stock not Transferred because of a
   reduction described in the preceding sentence are referred to as
   "Delayed Transfer Shares.")  EarthShell agrees to furnish accurate and
   complete information to the Khashoggi Holders, Stockholder and their
   respective professional tax advisors, as well as to EarthShell's own
   professional tax advisors, to allow them to assess such risk.

        5.   DELAYED TRANSFER SHARES.  In the event that a Khashoggi
   Holder or Stockholder is required, pursuant to paragraph 4, to reduce
   the number of shares of EarthShell Common Stock to be Transferred,
   then EarthShell shall use commercially reasonable efforts not to
   engage in any subsequent transaction involving EarthShell Common Stock
   (other than a Foreseeable Transaction taken into account in
   determining such reduction) that would have the effect of further
   postponing the date on which the Delayed Transfer Shares may be
   Transferred, until the Delayed Transfer Shares have been Transferred
   or are no longer proposed to be Transferred.

        6.   MISCELLANEOUS.

             (a)  REMEDIES.  Each Khashoggi Holder and Stockholder, in
        addition to being entitled to exercise all rights granted by law,
        including recovery of damages, will be entitled to specific
        performance of its rights under this letter.  Each party agrees
        that monetary damages would not be adequate compensation for any
        loss incurred by reason of a breach by it of the provisions of
        this letter.  Each of Stockholder, on the one hand, and the
        Khashoggi Holders, on the other hand, shall indemnify and hold
        harmless the other for any costs or damages (including reasonable
        attorneys' fees) resulting from a breach of any of the terms of
        this agreement by such party.  Each Khashoggi Holder and
        Stockholder shall be entitled to rely on any written advice or
        information provided by EarthShell or its professional tax

                                     F-3







        advisors in determining whether a Transfer of EarthShell Common
        Stock may be made pursuant to the terms of this letter.

             (b)  AMENDMENTS.  This letter shall not be modified or
        amended except by an instrument in writing signed by EarthShell,
        Essam Khashoggi and Stockholder (or their successors or permitted
        assigns).

             (c)  NOTICES.  All notices and other communications provided
        for or permitted hereunder shall be made in writing by hand-
        delivery, registered first-class mail, telex, telecopier, or air
        courier guaranteeing overnight delivery to the parties at their
        addresses at the top of this letter.  All such notices and
        communications shall be deemed to have been duly given when
        received by the addressee.

             (d)  SUCCESSORS AND ASSIGNS.  This letter shall inure to the
        benefit of and be binding upon the successors and permitted
        assigns of each of the parties and, in the case of the Khashoggi
        Holders, each Khashoggi Holder.  The undersigned shall cause each
        other Khashoggi Holder under his control to abide by the terms of
        this Agreement and shall be liable for any damages resulting from
        any breach of this Agreement by such other Khashoggi Holders, and
        Stockholder shall cause each affiliate to which shares of
        EarthShell Common Stock or Series C Convertible Preferred Stock
        may be transferred pursuant to clause (iii) of paragraph 1 to
        abide by the terms of this Agreement and shall be liable for any
        damages resulting from any breach of this Agreement by such
        affiliate.

             (e)  COUNTERPARTS.  This letter may be executed in any
        number of counterparts and by the parties hereto in separate
        counterparts, each of which when so executed shall be deemed to
        be an original and all of which taken together shall constitute
        one and the same agreement.

             (f)  GOVERNING LAW.  This Agreement shall be governed by and
        construed in accordance with the internal laws of the State of
        Delaware.

             (g)  ENTIRE AGREEMENT.  This letter is intended by the
        parties as a final expression of their agreement and intended to
        be a complete and exclusive statement of the agreement and
        understanding of the parties hereto in respect of the subject
        matter contained herein.  This letter supersedes all prior
        agreements and understandings whether written or oral and all
        contemporaneous oral agreements and understandings among the
        parties with respect to such subject matter.





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        If you agree that this letter accurately reflects the agreement
   between us, please so indicate by signing a copy of this letter and
   returning it to my attention.

                                           Sincerely,


                                           ESSAM KHASHOGGI


                                           /s/ Essam Khashoggi
                                           ___________________________
                                           Essam Khashoggi


   Agreed and accepted as of the 17th
   day of June, 2005

   RENEWABLE PRODUCTS LLC


   By: James A. Cooper
       __________________________
   Name:  James A. Cooper
   Title:  Vice President


   EARTHSHELL CORPORATION


   By: Scott Houston
       __________________________
   Name:  Scott Houston
   Title:  CFO

   By: __________________________
   Name:
   Title:





















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