The capsule storage tubes are designed to store Air-Tite Brand coin holders. The plug lid closes inside the tube and does not have an air-flow hole or lubrication. Each tube will hold 20 completely closed coin holders. The tubes do not provide any extra protection for the coins, they are only a storage solution. Capsules are PVC free, archival safe, and are made from an acrylic plastic with a non-yellowing agent. This process results in a product that is hard, crystal clear, and smooth to the touch. Our capsules are securely packaged, un-assembled, within layers of foam to protect them during shipment.