Set of 5 pieces of 11x14 Picture Mattes for 8x10 Photos with 5 backing boards and 5 crystal clear sleeve folding flap bags. US Art Supply Brand 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: 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.