Store and protect your valuable coins with Air-Tite Holders by Ultra PRO! Air-Tite makes injection mold high quality, crystal-clear acrylic coin holders. These holders are made of acrylic plastic with a non-yellowing agent. The end product consists of two, highly durable, crystal clear pieces (cover and base) that snap together and can securely store 1oz. Silver Bar & 1oz. Royal Canadian Mint .999 Gold Bar. Made with archival safe, ultra clear acrylic to keep your coins as good as new!