Pack of 50 8x10 Off White Mats Mattes with White Core Bevel Cut for 5x7 Photo + Backing + Bags Pack of 50 8x10 Off White Mats Mattes with White Core Bevel Cut for 5x7 Photo + Backing + Bags This item comes with 50 mats, 50 backing, and 50 bags The opening size is 4.5"x6.5" for 5x7 print. The mats are beveled cut with white core and 4-ply thick (about 1.4 mm or 1/16 inch). The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.