Acrylic plastic with a non-acid agent, this process results in a final product that is Hard, Crystal Clear and Smooth to the Touch. The cover and base snap together firmly to form a perfect seal. They are PVC Free, Archival Safe and are suitable for extended periods of long term coin or bar storage. With ring rims for 6 sizes of coins, up to 45 mm in diameter. Will not fit coins lager than 45 mm. Coin Capsules are securely packed within 6 layers of foam and two pieces of cardboard to protect them during shipment. These brand new capsules are shipped to you UN-Assembled for easy, trouble free handling and use. We take extra time to individually hand pack these coin holder capsules to ensure "NO-Scratch" MAXIUM protection during shipment.