This item comes with 20 pre-cut mats. The opening size is 7.5"x9.5" for 8x10 print. The mats are beveled cut. Our acid-free cream core matboards are a 4-ply paper mat that provide the aesthetic and design benefits of a bright white bevel. It can be used for matting photos, art, and needlepoint. Also great for crafts, backboards, signs, children s projects, and school projects.