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Gallery Pre-Cut Museum Mats contain patented Artcare Micro Chamber technology that actively protects artwork and photographs from fading and discoloration. 8-ply archival cotton rag mat. Archival mounting board. Mats have matching bevels (i.e., black mat has a black core). Mat opening position and sizes are stated below. Actual opening is approximately 1/2 in. smaller.Each mat sold individually.