The Air-Tite Plastic Capsules are designed to fit directly into the corresponding Air-Tite Display Holder. Shown in the three pictures above is the sequence of putting the case together and inserting into the blue holder. These two great products go hand-in-hand when it comes to protecting your coins, displaying them and if you're just looking for a nice way to store your coins, these Air-Tites are a fine choice. All Air-Tite holders are manufactured using acrylic plastic with a non-yellowing agent, producing a two piece, snap together, friction fit cover and base. Rings are produced from cross linked polyethylene, which is totally inert. None of the components of these materials contain any PVC. The holders are highly durable and scratch resistant. Rings are available in black or white. Available in several model sizes to accommodate coins, medals, and tokens ranging in size from 10 mm to 42 mm.