Regular capsules or snaplocks limit a coins exposure to ambient air and moisture. The highly porous, copper-based INTERCEPT TECHNOLOGY? material does even more: it neutralizes harmful atmospheric gases inside the capsule so that the coin is stored in a non-corrosive micro-climate. The INTERCEPT material protects coins from tarnishing for up to 15 years. It is non-toxic and will not leave any oil build-up or residue on the coin. The capsules are made of durable, crystal-clear, scratch-resistant plastic and are securely locking, yet easy-to-open. Capsule size: 2×2″ (50 x 50 mm).