Golden State Art, Pack of 10 8x10 White Picture Mats with White Core Bevel Cut for 5x7 Pictures Pack of 10 8x10 White Picture Mats with White Core Bevel Cut for 5x7 Pictures This item comes with 10 8x10 single mats. Backing board is not included. Inside (opening) Size: 4.5x6.5 (bevel cut), Color is White White core and 4-ply thick (about 1.4 mm or 1/16 inch). Perfect for framing 5x7 photos in an 8x10 picture frame. THIS ITEM DOESN'T INCLUDE BACKING BOARD.