The BCW Resealable Silver Age Comic Bags are an acid free, archival quality product made of crystal clear polypropylene. These bags have a reusable adhesive tape strip on the body of the bag so the collector can fold the top flap over and lock in the comic. Holds silver age comics. Acid-free, safe storage. Resealable strip on back of bag. Use with BCW Silver Backing Boards. 100 Bags per Pack. Exterior Dimensions: 7 1/8″ x 10 1/2″.