Set of 100 pieces of 8x10 Picture Mattes for 5x7 Photos with 100 backing boards and 100 crystal clear sleeve folding flap bags. Mat Board Center Brand Premium High Quality Mattes, Backers & Plastic Sleeve's that are all Made in the USA by Crescent. The Opening Size is 4.5" x 6.5" 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 set is Professionally Packed and Boxed to Assure that All Precautions have been made for a Save Arrival of your purchase.