The A-Zoom Action Proving Dummy Snap Caps are precision machined from aluminum to exacting tolerances. They feature a hard anodized finish that provides ultra-smooth functioning and long cycling life. These are perfect for dry fire practice, training and function testing, and teaching safety or storing your firearms with the spring relaxed for longer spring life. Dry Fire Hit Rating: 3000+Specifications and Features: Cartridge: 9mm Luger Country of Origin: United States of America Material: Aluminum Quantity: 5