Set of 25 pieces of 8x10 Picture Mats for 5x7 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 4.5 x 6.5 for 5x7 inch pictures. 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 side. The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.