Golden State Art, Pack of 20 12x16 WHITE Picture Mats with White Core Bevel Cut for 8x12 Pictures Pack of 20 12x16 WHITE Picture Mats with White Core Bevel Cut for 8x12 Pictures This item comes with 20 12x16 single mats Inside (opening) Size: 7.5x11.5 (bevel cut), Color is WHITE White core and 4-ply thick (about 1.4 mm or 1/16 inch). Perfect for framing 8x10 photos in an 11x14 picture frame. THIS ITEM DOESN'T INCLUDE BACKING BOARD.