Pack of 50 sets of 8x10 WHITE Picture Mats Mattes Matting for 5x7 Photo + Backing + Bags Set of 50 pieces of 8x10 Picture Mats with white core bevel pre-cut for 5x7 Photo with backing boards and bags This item comes with the 50 pre-cut mats, 50 backing boards and 50 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.