The opening size is 15.5"x19.5" for 16x20 print + backing board

 Our acid-free blackcore matboards are a 4-ply papermat that provide the aesthetic and design benefits of a bright white bevel., Each sheet of mat board has a richly colored front surface, a blackcore and a white backing. It can be used for matting photos, art, and needlepoint. Also great for crafts, backboards, signs, children's projects, and school projects.

Other color is also available upon request.

Quantity 1 = 10 mats and 10 backing.

(Free Shipping available for continental US only. For PR, Alaska, Hawaii, APO and FPO please email us first)