Golden State Art, Pack of 20 11x14 Ivory/Ivory Double Mats Mattes with White Core Bevel Cut for 8x10 Photo + Backing + Bags Pack of 20 11x14 Ivory/Ivory Double Mats Mattes with White Core Bevel Cut for 8x10 Photo + Backing + Bags This item comes with 20 11x14 single mats, 20 backing, and 20 bags The opening size is 10.5"x13.5" for 11x14 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.