7" Picture Sleeve Cardboard Backing
7-3/16 x 7-1/4". Made from .040 thick, buffered, acid-free board. White all the way through. Use for indefinite-term storage.
Made of Conservation Grade Alpha-Cellulose board. Lignin-free, acid-free and buffered. Approved for archival, indefinite-term storage by the Library of Congress. Use behind a 7" picture sleeve or jacket when it is stored in a poly sleeve. Help keep picture sleeves from getting bent corners and ragged edges.