Ammo-guard 22 is a Multi-Metal Volatile Corrosion Inhibiting product used mainly for enhancing shelf-life of arms and ammunition. The Ammo-guard 22 card releases vapors of corrosion inhibitor molecules that form an invisible & passive layer on metal that resists corrosion.  Arms and ammunition are made of multiple kinds of metals such as copper, brass, steel, aluminum, zinc and chrome platings etc. that can corrode overtime. This can result in failures and accidents during use.