Pack of 10 16x20 Black/Black Double Mats Mattes with White Core Bevel Cut for 11x14 Photo + Backing + Bags Pack of 10 16x20 Black/Black Double Mats Mattes with White Core Bevel Cut for 11x14 Photo + Backing + Bags This item comes with 10 16x20 Double mats, 10 backings, and 10 bags The Double Mat opening size is 10.5"x13.5" for 11x14 print. Color: Black over Black Double mat is white core and 4-ply thick over 4-ply thick (each 4-ply is about 1.4 mm or 1/16 inch) Clear bag has a re-sealable adhesive Strip below the opening of the bag instead of on the flap