Golden State Art, 20 11x14 Black Mats Matting for 8.5x11 + backing + bags 20 11x14 Black Mats Matting for 8.5x11 + backing + bags This item comes with 20 11x14 single mats, 20 backing, and 20 bags The backing is also 4-ply. The opening size is 8"x10.5" for 8.5x11 print. Please Unwrap the plastic wrap & Flip the first mat over to see the actual color mat.