AMENDMENT NO.6 TO THE AMENDED AND RESTATED ADDENDUM TO FINE PAPERS SUPPLY AGREEMENT

Exhibit 10.12.10

AMENDMENT NO. 6

to the

AMENDED AND RESTATED ADDENDUM to

FINE PAPERS SUPPLY AGREEMENT

between

PHILIP MORRIS USA INC.

and

SCHWEITZER-MAUDUIT INTERNATIONAL, INC.

This Amendment No. 6, effective December 31, 2005, is by and between Philip Morris USA Inc. (formerly Philip Morris Incorporated), a Virginia corporation doing business as Philip Morris U.S.A. (“Buyer”), and Schweitzer-Mauduit International, Inc., a Delaware corporation (“Seller”).

RECITALS

Whereas, Buyer and Seller have previously entered into the Second Amended and Restated Agreement for Fine Paper Supply, effective July 1, 2000, which has been amended by Amendment No. 1, effective May 23, 2002, Amendment No. 2, effective January 1, 2003, Amendment No. 3, effective August 11, 2003, Amendment No. 4, effective January 1, 2004, Amendment No. 5, effective December 15, 2004 and Amendment No. 6, effective December 31, 2004 (as amended, the “Agreement”);

Whereas, Buyer and Seller have also previously entered into the Amended and Restated Addendum to Fine Papers Supply Agreement, effective July 1, 2000, amended by Amendment No. 1, effective August 4, 2000, Amendment No. 2, effective January 25