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Featured Product
21x21 Square Cut Mat
A 21x21 mat refers to the outside dimension of your mat and is designed to fit into into a 21x21 frame. A 21x21 custom cut mat works best for artwork from 10x10 to 17x17 inches in size. Select your mat by its outside dimension then specify your inside dimension. For more information, check out our tips for measuring and ordering mats.