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: black/white). 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.