Golden State Art, Pack of 10 16x20 White Picture Mats, 8-ply, with White Core Bevel Cut for 11x14 Pictures Pack of 10 16x20 White Picture Mats, 8-ply, with white Bevel Cut for 11x14 Pictures This item comes with 10 16x20 single mats. THIS ITEM DOESN'T INCLUDE BACKING BOARD. Inside (opening) Size: 10.5x13.5 (bevel cut), Color is WHITE White core and 8-ply thick (1/8 inch). Please check if this mat fits your frame since it's 8-ply thick while regular mats are 4-ply thick.