100 Pcs of 8x10 Picture Mats Mattes Matting for 5x7 Photo + Backing + Bags, Mix Color 100 pcs of 8x10 Picture Mats Mattes Matting for 5x7 Photo + backing + bags The mats are cutted at beveled. The backing is also 4-ply. The opening size is 4.5"x6.5" for 8x10 print. The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.