Golden State Art, Pack of 20 MIXED COLORS 11x14 Picture Mats Matting with White Core Bevel Cut for 8x10 Pictures Pack of 20 11x14 Mix color Picture Mats with White Core Bevel Cut for 8x10 Pictures This item comes with 20 11x14 single mats. Backing board is not included. Inside (opening) Size: 7.5x9.5 (bevel cut), Color is assorted. 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.