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The opening size is 12.5"x18.5" for 13x19 print.
The mats are bevel cut.
The backing is also 4-ply.
Our acid-free white core mat boards are 4-ply paper mats 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, art exhibits, and school projects.