A snap cap with impregnated VCI (Volatile Corrosion Inhibitor) technology. A simple idea for protecting all metals from rust and corrosion just by placing one into the chamber of your gun. Leaves no scent residue, gives 30 cubic feet of protection and comes in 12 gauge, 20 gauge, Centerfire and Pistol Plugs offered in Universal and 22 caliber. Remington's Moisture Guard VCI/Blend is the most scientifically advanced formula for protecting and lubricating metal surfaces and equipment from rust and corrosion. Special Volatile Corrosion Inhibitor (VCI) provides the ultimate protection from the harshest of elements and is able to penetrate into the smallest cracks and crevices while our vapor technology blends with moisture and oxygen to stop rust and corrosion in its tracks. Designed for long lasting protection in mind, these products should be the last application prior to storing any metal gear or equipment.