Pack of 100 5x7 BLACK Picture Mats Mattes with White Core Bevel Cut for 4x6 Photo + Back + Bags This Set comes with the 100 5x7 pre-cut mats, 100 backing boards and 100 clear bags. The mat 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 4 mm or 1/16 inch), The backing has white on both side. Please Unwrap the plastic wrap & Flip the first mat over to see the actual color mat. The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.