Guardhouse Direct Fit Round Holders are made of a virgin styrene acrylic polymer that is free of all oils and contaminants. The quality of the material ensures long term crystal clear clarity. Coin is held snugly in a sealed chamber, but the capsules are also designed so that they can be opened if needed. Interior; 30.6mm, Depth; 5.05mm, Exterior 36.40mm. Packed 50 pieces per box. Holds Half Dollars (1837 ~ present) or coins of same size.