Mat Board Center, Pack of 25 11x14 White Picture Mats with Black Core Bevel Cut for 8x10 Photos 100% brand new, high quality, Acid Free mat boards. This item includes only 25 11x14 White mats with Black Core. Perfect for framing 8x10 photos in an 11x14 picture frame. Outside Dimensions: 11x14", Inside Dimensions: 7.5x9.5" bevel cut. Standard 4 ply: 1.4 mil or 1/16 inch.