Golden State Art, Pack of 200, 5x7 White Mat with Black core for 4x6 Pictures Set of 200 5x7 White Picture Mats with Black Core for 4x6 Photo. This item comes with the 200 pre-cut mats only. The opening size is 3.5"x5.5" for 4x6 print. Color: WHITE with BLACK CORE. The mats are beveled cut and 4-ply thick (about 1.4 mm or 1/16 inch). THIS ITEM DOESN'T INCLUDE BACKING BOARD.