Set of 50 pieces of 11x14 Picture Mattes for 8x10 Photos with 50 backing boards and 50 crystal clear sleeve folding flap bags. Premium High Quality Mattes, Backers & Plastic Sleeve s that are all Made in the USA by Crescent. The Opening Size is 7.5" x 9.5" for 8x10 photo prints. Color: White. The mats are beveled cut with white core and 4-ply thick (about 1.4 mm or 1/16 inch), The backing is white on both sides. It can be used for matting photos, art, and needlepoint. Also great for crafts, backboards, signs, children s projects, and school projects.