Our acid-free white core double mats are a 4-ply paper mat over 4-ply paper mat that provide the aesthetic and design benefits of a bright white bevel., Each sheet of mat board has a richly colored front surface, a white core and a white backing. It can be used for matting photos, art, and needlepoint. Also great for crafts, backboards, signs, children's projects, and school projects. Set includes: Ten 11x14 Double mat Picture Mats with White Core Bevel Cut for 8x10 Pictures (Color: Ivory Turret/Green). Ten 11x14 Backing Board (4-ply or 1/16 inches thick, Color: White on both sides). Ten 11 1/4 x 14 1/8 inches Clear bags.