Pinit Archival-Grade Matboard. 100% pure Alpha-Cellulose. 16 x 20" with Window for 11 x 14" image. Available in 18 colors SKU: KMB1620w1114 (0)No Reviews yet Add to Shopping Cart Details 'Select' Archival-Grade Matboard16 x 20" with window for 11 x 14" image. 100% Pure Alpha Cellulose White Core & Back.4-Ply .060" thick. Buffered, Aci... Details Back Details'Select' Archival-Grade Matboard16 x 20" with window for 11 x 14" image. 100% Pure Alpha Cellulose White Core & Back.4-Ply .060" thick. Buffered, Acid-free, lignin-free.Choose from 18 matboard colors. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review