golden state art, pack of 10 white pre-cut 16x20 picture mat for 11x14 photo with white core bevel cut mattes sets. includes 10 high premier acid free mats & 10 backing board & 10 clear bags golden state art set of 10 pieces of 16x20 picture mattes for 11x14 photos with 10 backing boards and 10 crystal clear sleeve protective bags. golden state art brand premium high quality mattes, backers & plastic clear bags .the mat opening size is 10.5" x 13.5" for 11x14 photo prints. the backing is 4-ply, white on both sides, and core is brown. 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.