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These sleeves are made of Archival POLYESTER (Mylar), an inert material of the highest clarity. Polyester will not discolor, damage or adhere to items placed inside it. It is a sturdy film that will give extra support to fragile documents. Use Polyester (Mylar) to ensure your collectibles remain in excellent condition for years to come. Polyester is used world wide in museums, libraries, and archives. This polyester material is approved by the Library of Congress for archival storage. - MUSEUM GRADE ARCHIBVAL - 13 x 13 4mil - NO Flap - Use for 12" Records - 10 per pack |