Golden State Art, Pack of 20 11x14 Black/Metallic Gold Double Mats Mattes with White Core Bevel Cut for 8x10 Photo + Backing + Bags Pack of 20 11x14 Black/Gold Double Mats Mattes with White Core Bevel Cut for 8x10 Photo + Backing + Bags This item comes with 20 11x14 Double mats, 20 Backing, and 20 Clear Bags. Opening size is 7.5"x9.5" for 8x10 print. Double mat is Bevel Cut with white core, 4-ply thick over 4-ply thick (each 4-ply is about 1.4 mm or 1/16 inch). The Clear bag has re-sealable adhesive strip below the opening of the bag instead of on the flap.