Exhibit 99 Additional Information

          Valhi, Inc. ("Valhi")     and NL  Industries,  Inc.  ("NL")  are the  holders  of  56.9%  and  35.8%,respectively,  of the  outstanding  shares of common stock,  par value $0.01 pershare ("Common Stock"), of the issuer.

        Valhi  and TIMET FinanceManagement  Company ("TFMC") are the direct holders of  approximately  83.1% and0.5%,  respectively,  of the outstanding  common stock of NL. Valhi Group,  Inc.("VGI"),   National  City  Lines,   Inc.   ("National"),   Contran   Corporation("Contran"), the Harold Simmons Foundation, Inc. (the "Foundation"), the ContranDeferred  Compensation  Trust No. 2 (the "CDCT No. 2") and The  Combined  MasterRetirement  Trust (the "CMRT") are the direct  holders of  approximately  78.9%,9.3%,  2.1%,  0.9%, 0.4% and 0.1%,  respectively,  of the outstanding  shares ofValhi common  stock.  National,  NOA,  Inc.  ("NOA") and Dixie  Holding  Company("Dixie  Holding")  are the direct  holders of  approximately  73.3%,  11.4% and15.3%, respectively, of the outstanding common stock of VGI. Contran and NOA arethe  direct  holders of  approximately  85.7% and  14.3%,  respectively,  of theoutstanding  common  stock of National.  Contran and  Southwest  Louisiana  LandCompany,  Inc.  ("Southwest") are the direct holders of approximately  49.9% and50.1%,  respectively,  of the  outstanding  common  stock  of  NOA.  Dixie  RiceAgricultural  Corporation,  Inc.  ("Dixie Rice") is the direct holder of 100% ofthe outstanding common stock of Dixie Holding.  Contran is the holder of 100% ofthe  outstanding  common  stock of Dixie  Rice  and  approximately  88.9% of theoutstanding common stock of Southwest.

        Substantially   all   ofContran's outstanding voting stock is held by trusts established for the benefitof certain children and  grandchildren  of Harold C. Simmons (the "Trusts"),  ofwhich Mr.  Simmons is the sole trustee,  or is held by Mr. Simmons or persons orentities related to Mr. Simmons.  As sole trustee of the Trusts, Mr. Simmons hasthe power to vote and direct the disposition of the shares of Contran stock heldby the Trusts. Mr. Simmons disclaims  beneficial ownership of all Contran sharesthat the Trusts hold.

        Harold C. Simmons is thechairman of the board and chief  executive  officer of each of the issuer and NLand the  chairman  of the  board of each of Valhi,  VGI,  National,  NOA,  DixieHolding, Dixie Rice, Southwest and Contran.

        The  Foundation directlyholds  approximately  0.9% of the outstanding  shares of Valhi common stock. TheFoundation is a tax-exempt foundation organized for charitable purposes.  HaroldC. Simmons is the chairman of the board of the Foundation.

        The  CDCT No. 2 directlyholds  approximately  0.4% of the outstanding shares of Valhi common stock. U.S.Bank  National  Association  serves as the  trustee  of the CDCT No. 2.  Contranestablished the CDCT No. 2 as an irrevocable  "rabbi trust" to assist Contran inmeeting  certain  deferred  compensation  obligations  that it owes to Harold C.Simmons.  If the CDCT No. 2 assets are insufficient to satisfy such obligations,Contran is  obligated  to satisfy the balance of such  obligations  as they comedue.  Pursuant to the terms of the CDCT No. 2,  Contran (i) retains the power tovote the  shares of Valhi  common  stock held  directly  by the CDCT No. 2, (ii)retains  dispositive power over such shares and (iii) may be deemed the indirectbeneficial owner of such shares.

        The  CMRT directly holdsapproximately  0.1% of the  outstanding  shares  of Valhi  common  stock.  Valhiestablished  the CMRT to permit the collective  investment by master trusts thatmaintain  the  assets of  certain  employee  benefit  plans  Valhi  and  relatedcompanies adopt.  Harold C. Simmons is the sole trustee of the CMRT and a memberof the trust  investment  committee  for the CMRT.  Valhi's  board of  directorsselects the trustee and members of the trust investment  committee for the CMRT.Mr. Simmons is a participant  in one or more of the employee  benefit plans thatinvest through the CMRT.

        By virtue of the holding     of the offices,  the stock  ownership  and his services as trustee,  all asdescribed  above,  (a) Harold C. Simmons may be deemed to control such  entitiesand (b) Mr.  Simmons  and  certain  of such  entities  may be deemed to  possessindirect  beneficial  ownership of shares directly held by certain of such otherentities. However, Mr. Simmons disclaims such beneficial ownership of the sharesbeneficially owned directly or indirectly by any of such entities, except to theextent of his vested beneficial interest, if any, in shares held by the CMRT andhis interest as a beneficiary  of the CDCT No. 2. Mr. Harold  Simmons  disclaimsbeneficial  ownership  of all  shares of Common  Stock  that  Valhi,  NL or TFMCdirectly holds.

        TFMC  owns 5,203  sharesof  Common  Stock.  Titanium  Metals  Corporation  ("TIMET")  owns  100%  of theoutstanding  common stock of TFMC.  Tremont LLC ("Tremont"),  Harold C. Simmons'spouse, the CMRT and Valhi are the holders of approximately  39.5%, 14.3%, 12.0%and 3.3% of the outstanding common stock of TIMET. Valhi is the direct holder of100% of the  membership  interests of Tremont.  The ownership of Ms.  Simmons isbased on the  1,600,000  shares  of  TIMET’s  6 3/4%  Series A  ConvertiblePreferred  Stock,  par value $0.01 per share (the "Series A Preferrred  Stock"),that  she  directly  owns,  which  are  convertible  into  2,666,666  shares  ofTIMET’s  common  stock.  The ownership of Valhi  includes  24,500 shares ofTIMET’s common stock that Valhi has the right to acquire upon conversion of14,700  shares of Series A  Preferred  Stock  that  Valhi  directly  holds.  Thepercentage  ownership of TIMET’s common stock held by Ms. Simmons and Valhiassumes the full conversion of only the shares of Series A Preferred Stock ownedby her or Valhi,  respectively.  Harold C.  Simmons is vice  chairman  of of theboard of TIMET and chairman of the board of Tremont.

        Harold    C.    Simmons'spouse is the direct owner of 36,356 shares of Common Stock, 69,475 shares of NLcommon stock, 43,400 shares of Valhi common stock and 1,600,000 shares of SeriesA Preferred  Stock,  which are convertible  into 2,666,666  shares of TIMETcommon stock. Mr. Simmons may be deemed to share indirect  beneficial  ownershipof such shares. Mr. Simmons disclaims all such beneficial ownership.

        Harold     C.    Simmonsdirectly  holds 4,255 shares of Common  Stock,  30,800 shares of NL common stock(including stock options exercisable for 4,000 shares) and 3,383 shares of Valhicommon stock.

        A trust, of which HaroldC.  Simmons  and  his  spouse  are  trustees  and  the   beneficiaries  are  thegrandchildren  of his  spouse,  is the direct  holder of 40,000  shares of Valhicommon stock.  Mr. Simmons,  as co-trustee of this trust,  has the power to voteand direct the  disposition of the shares of Valhi common stock the trust holds.Mr. Simmons disclaims  beneficial  ownership of any shares of Valhi common stockthat this trust holds.

        NL  and a subsidiary  ofNL  directly  own  3,522,967  and  1,186,200   shares  of  Valhi  common  stock,respectively.  Pursuant to Delaware law, Valhi treats the shares of Valhi commonstock  that  NL and  the  subsidiary  of NL own as  treasury  stock  for  votingpurposes.  For the purposes of the percentage  calculations  herein, such sharesare not deemed outstanding.