Golden State Art, Acid Free, Pack of 10 11x14 Black Picture Mats Mattes with White Core Bevel Cut for 8x10 Photo Pack of 10 11x14 BLACK Picture Mats with White Core Bevel Cut for 8x10 Pictures This item comes with 10 11x14 single mats Inside (opening) Size: 7.5x9.5 (bevel cut), Color is BLACK 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.