The opening size is 10.5"x13.5" for 11x14 print.
The mats are beveled cut.
The backing is also 4-ply.
The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.
Our acid-free blackcore matboards are a 4-ply papermat that provide
the aesthetic and design benefits of a black bevel. It can be used for matting photos, art, and needlepoint.
Also great for crafts, backboards, signs, children's projects, and