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; 17.9mm, Depth; 5.10mm, Exterior 31.05mm. Packed 50 pieces per box. Holds Dimes (1829 ~ present) or coins of same size.