●Package included: 12pcs black 12x16 uncut picture mat boards, backign boards ●Core & Thickness: Each picture mat board is white core and 4-ply thickness (about 1.4 mm or 1/16 inch). ●Reliable quality: The black mat boards for a 12x16 frame make of acid-free paper, which makes it long-lasting and non-yellowing. ●Various Usage: This cardboard is great for making DIY projects, presentation boards, posters, and other art crafts. Personalize your artwork and decorate your home. ●Multi Size: We have different sizes of photo mat boards, you can choose according to your needs to fit your mat board.