Golden State Art, Pack of 20 16x20 WHITE Picture Mats with White Core Bevel Cut for 11x14 Pictures Pack of 20 16x20 WHITE Picture Mats with White Core Bevel Cut for 11x14 Pictures This item comes with 20 16x20 single mats Inside (opening) Size: 10.5x13.5 (bevel cut), Color is WHITE White core and 4-ply thick (about 1.4 mm or 1/16 inch) THIS ITEM DOESN'T INCLUDE BACKING BOARD.