2x2 Coin Snap Holder for premium display or long- term storage of coins.Made of inert polystyrene will not harm coins.Insert with Black foam on one side and White Paper on the other.100% Archival Plastic. No PVC!2- Piece Snap Together Design. (Pack of 25)These holders are intended for premium long- term archival storage or display of your coins. Made of inert high impact, crystal clear polystyrene a 100% archival plastic the holder will not harm coins.