Golden State Art, Pack of 50 White Pre-Cut 5x7 Picture Mat for 4x6 Photo with White Core Bevel Cut Mattes Sets. Includes 50 High Premier Acid Free Bevel Cut Matts & 50 Backing Board & 50 Clear Bags Pack of 50 5x7 White Picture Mats Mattes with White Core Bevel Cut for 4x6 Photo + Backing + Bags This item comes with 50 single white mats, 50 backing, and 50 bags. The opening size is 3.5"x 5.5" for 4x6 print. Color: White The mats are beveled cut with white core and 4-ply thick (about 1.4 mm or 1/16 inch). The backing board is white on both sides and core is brown. The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.