Mat Board Center, Pack of 50, 5x7 White Picture Mats with White Core for 4x6 Pictures Pack of 50 5x7 Picture Mats for 4x6 Photo This item comes with 50 single mats The opening size is 3.5"x5.5" for 4x6 print. Color: WHITE The mats are beveled cut with white core and 4-ply thick (about 1.4 mm or 1/16 inch), THIS ITEM DOES NOT INCLUDE BACKING BOARDS OR CLEAR BAGS.