Mat Board Center Premier Crescent Acid-Free Pre-Cut 8x10 White Picture Mat Sets. Includes a Pack of 10 White Core Bevel Cut Matte for 5x7 Photos, Pack of 10 Backers & 10 Clear Bags Set of 10 pieces of 8x10 Picture Mattes for 5x7 Photos with 10 backing boards and 10 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 4.5"x6.5" for 5x7 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. The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.