Golden State Art, Pack of 25 8x10 black Picture Mats Mattes with White Core Bevel Cut for 5x7 Photo + Backing + Bags This set comes with the 25 pre-cut 8x10 mats, 25 backing boards and 25 clear bags. The mat opening size is 4.5"x6.5" for 5x7 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. For Mats: Please Unwrap the plastic wrap from the package & Flip the first mat over to see the actual color mat.