10 pcs of new 16x20" Quality Picture Mats. The Openings are Bevel cut 10.5" x 13.5" to fit a 11x14 photo or print. These mats are cut from Quality white core mat board and are excellent for framing photos or prints. Also great for crafts, backboards, signs, children"s projects, and school projects. Thickness: 4-ply: 1.4mil or 1/16 inch These are Acid Free matboards.