Mat Board Center, High Quality Pack of 25 sets 11x14 Assorted Mix Colors White Core Picture Mats for 8x10 Photo with Backing and Clear Bags High Quality Set of 25 sets of 11x14 White Core Picture Mats for 8x10 Photos with backing boards and bags The opening size is 7.5"x9.5" for 8x10 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.