The BCW Silver Comic Bags are an acid free, archival quality product made of crystal clear polypropylene. Use this item to protect and store your collectible silver comics. Available in 2 sizes so you can now fit your thickest silver comics into the appropriate bag. Holds silver age comics. Acid-free, safe storage. Use with BCW Silver Backing Boards. 100 Bags per Pack. Exterior Dimensions: 7 1/8″ x 10 1/2″.