Golden State Art, Pack of 100 Pcs of 5x7 Mix Color Picture Mats Mattes Matting for 4x6 Photo + Backing + Bags Set of 100 pieces of 5x7 Picture Mats for 4x6 Photo with backing boards and bags This item comes with the 100 pre-cut mats, 100 backing boards and 100 clear bags. The opening size is 3.5"x5.5" for 4x6 print. Please note the combination of assorted color is random and dependent on our stock. The mats are beveled cut with white core and 4-ply thick (about 1.4 mm or 1/16 inch), The backing is white on both side. The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.