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. - Resealable for your silver comic needs - 2 mil material thickness - 1 1/2 inch flap for closure - Crystal clear - Protect comics while handling - Use with BCW Silver Backing Boards