Mat Board Center, Crescent Pack of 25 sets 8x10 MIXED COLORS White Core Picture Mats Mattes Matting for 5x7 Photo + Backing + Bags Crescent High Quality Set of 25 pieces of 8x10 Picture Mats for 5x7 Photo with backing boards and bags The opening size is 4.5"x6.5" for 5x7 print. Color: Mixed color The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap. This item comes with the 25 pre-cut mats, 25 backing boards and 25 clear bags. 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 side.