The Ammo Cloak uses Corrosion Inhibiting Skin (CIS) technology. Once sealed, the CIS vapor from the Ammo Cloak emits and adheres to the metal parts of the ammunition. This provides a molecular “skin” that prevents corrosion. Smooth, clean ammunition ejects faster and jams less. The CIS will penetrate standard, unsealed factory boxes to protect ammunition. Remove boxes from case and store in Ammo Cloak. The Tactical Ammo Cloak shelf life is 24 months. For additional protection in gun safes, get the Gun Protect Safe Environment Module. It provides 20 cubic feet of CIS protection for 12 months. Or the twin pack that provides 40 cubic feet of protection for 12 months with a 25lb capacity.