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The opening size is 3.5"x5.5" for 4x6 print.
The mats are cut at a bevel.
Our acid-free white-core matboards are a 4-ply paper mat that provide the aesthetic and design benefits of a bright white bevel.
Each sheet of mat board has a richly colored front surface, a white core and a white backing. It can be used for matting photos, art, and needlepoint.
It is great for crafts, backboards, signs, children's projects, and school projects.