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Pre-cut double layer black mat kit._x000D_
Each archival series mat kit includes bevel - cut, archival alpha - cellulose 0.0625 in. thick mat board that is acid - free and lignin - free, 0.125 in. thick archival and acid - free foam core, and an archival polypropylene crystal clear envelope with self - adhesive closure._x000D_
Meets all Library of Congress conservation standards.