Golden State Art, Pack of 50 8x10 Mix Color Picture Mats Mattes with White Core Bevel Cut for 5x7 Photo + Backing + Bags Set of 50 pieces of 8x10 Picture Mats for 5x7 Photo with backing boards and bags This item comes with the 50 pre-cut mats, 50 backing boards and 50 clear bags. The opening size is 4.5"x6.5" for 5x7 print. Color: Mix Color 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.