Golden State Art, Pack of 25, 16x20 White Picture Mats Mattes with White Core Bevel Cut for 11x14 Photo Pack of 25 16x20 White Picture Mats Mattes with White Core Bevel Cut for 11x14 Photo This item comes with 25 single mats The opening size is 10.5"x13.5" for 11x14 print. The mats are beveled cut with white core and 4-ply thick (about 1.4 mm or 1/16 inch).