The Z5 model is made from acrylic plastic with a non-yellowing agent, a process that results in a final product that is hard, crystal clear, and smooth to the touch. The cover and base snap together firmly to form a perfect seal. Capsules are PVC free, archival safe, and suitable for extended periods of long term coin or bar storage. Coin capsules are securely packaged un-assembled within layers of foam to protect them during shipment. Made in the USA.