Pack of 10 RED 16x20 Picture Mats Matting with White Core Bevel Cut for 11x14 Pictures 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)