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 two sizes so you can now fit your thickest silver comics into the appropriate bag. Holds silver age comics. Acid-free, safe storage. Wider bag fits annuals and 80-page giants. Use with BCW Silver Backing Boards. 100 Bags per Pack. Exterior Dimensions: 7 1/4″ x 10 1/2″.