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These are standard postcard size cards and we have protective sleeves for them in polyethylene, polypropylene, and polyester (mylar). Since they are potentially very collectible – polyester might be your best bet for a sleeve. Polyester is approved by The Library of Congress as the safest material for paper products and long-term storage. Find the link here. https://www.bagsunlimited.com/category/96/sleeves
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