Set of 25 pieces of 11x14 Picture Mats for 8x10 Photo with backing boards and bags This item comes with the 25 pre-cut mats, 25 backing boards and 25 clear bags. The opening size is 7.5"x9.5" for 8x10 print. Color: Assorted 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. The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.