Package of 10 pre-cut mats with white core bevel cut * These are Acid Free matboards, Standard 4 ply: 1.4 mil or 1/16 inch * Perfect for framing 11x14 photos in an 16x20 picture frame. * Outside Dimensions: 16x20" * Inside Dimensions: 10.5x13.5" bevel cut (to fit 11x14 photo)