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Size:11 x 14 50 White Backing (V1) Package of 50 11×14 backing boards for matting, mounting, many other craft projects. This acid free on the surface and bottom, however the core is brown and not acid free. Perfect for mounting and adding finishing touch to your mat frames. Used for matting, crafts, projects, schools, events, signs, shows, etc. Backing: 4 ply thickness (about 1.4 mm)