Hard Plastic Comic Book Topload Holders offer Rigid protection of your Current or Silver Age Comics at a reasonable price. These protectors are essentially 2 sheets of clear plastic with welds on 3 sides and rounded corners. They load from the top. The PVC used in BCW Brand Topload holders contains no plasticizers or stearates. BCW's high impact grade PVC does not migrate and will not harm your collectible comic books.