Pack of 25 sets of 8x10 BLACK Picture Mats Mattes Matting for 5x7 Photo + Backing + Bags Set of 25 pieces of 8x10 Picture Mats with white core bevel pre-cut for 5x7 Photo with backing boards and bags This item comes with the 25 pre-cut mats, 25 backing boards and 25 clear re-sealable bags. These are Acid Free matboards, Standard 4 ply: 1.4 mil or 1/16 inch. The backing is white on both side. Outside Dimensions: 8x10", Inside Dimensions: 4.5x6.5" bevel cut (to fit 5x7 photo) Perfect for framing 5x7 photos in an 8x10 picture frame. The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.