This specially made capsule features a shorter bottom half with an extra tall top, designed to hold ultra-thick/high relief coins and medallions. Due to this process, the inner foam ring has a depth of 4mm and will not be as tall as the overall capsule. These capsules are Made in the USA from an acrylic plastic with a non-yellowing agent. This process results in a final product that is hard, crystal clear, and smooth to the touch. The cover and base close together firmly to form a perfect seal. The capsules are PVC Free, archival Safe are suitable for extended periods of long term coin or bar storage. The Rings are made of an inert cross linked polyethylene. The rings secure the coin in the holder. They will create an additional barrier against air contamination and also presents an attractive border to accent the coin. The Queen's Beast has a diameter of 38.61mm. You will need to insert your coin by compressing the ring with the coin on one side. Then lay the coin in the capsule and wait for the ring to un-compress itself. This will allow a nice fit without the ring being smashed.