topseller100, Pack of 50 sets of 11x14 BLACK Picture Mats Mattes Matting for 8x10 Photo + Backing + Bags Set of 50 pieces of 11x14 Picture Mats with white core bevel pre-cut for 8x10 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: 11x14", Inside Dimensions: 7.5x9.5" bevel cut (to fit 8x10 photo) Perfect for framing 8x10 photos in an 11x14 picture frame.