Pack of 100 5x7 BLACK Picture Mats Mattes with White Core Bevel Cut for 4x6 Photo + Back + Bags Set of 100 pieces of 5x7 Picture Mats for 4x6 Photo with backing boards and bags This item comes with the 100 pre-cut mats, 100 backing boards and 100 clear bags. The opening size is 3.5"x5.5" for 4x6 print. Color: BLACK 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.