Mat Board Center Crescent 11x14 Black Picture Mat Sets for 8x10 Photo. Includes a Pack of 25 White Core Bevel Pre-cut White Core Matte & 25 Backing Backers Board & 25 Clear Bags Set of 25 pieces of 11x14 Picture Mattes for 8x10 Photos with 25 backing boards and 25 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"x9.5" for 8x10 photo prints. Color: Black 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. The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.