This 20" x 394' roll of Photo Book Paper from Kodak is a 6.65 mil thick color negative photo paper with a lustre surface finish, a high D-max, and a wide tone scale for accurate color. It is optimized for use in photo books and other applications where thinner paper is required. It also provides natural skin tones along with rich, bright color. It is designed to work with the RA-4 process and offers a dye stability of about 100 years in home display, about 200 years in home storage, and about 20 months in a commercial display. The paper also has the ability to be calibrated for digital printing.