Rust and Corrosion Protection for: Steel, Iron, Brass, Copper Aluminum, Silver and Nickel Inhibits rust and corrosion for 1 year. Zerust NoRust Vapor Capsule creates an invisible vapor shield around Aluminum, Brass, Copper, Iron, Steel, and Silver from rust. Place Zerust NoRust Vapor Capsule inside firearm cabinets, safes, rifle bags, tool boxes, utility drawers, tackle boxes, knife drawers, tool cabinets, truck boxes, golf bags, garage cabinets, basement storage locker containers, any enclosure to prevent rust and corrosion. Zerust NoRust Vapor Capsule an invisible vapor that forms a corrosion and rust resistant barrier on metal surfaces. Vapor Corrosion Inhibitors (VCI) have been used for years to protect metal parts in industrial and commercial applications. One small capsule protects a radius of 2 feet for one year. Capsule Size: 2-1/8" x 1-1/4" x 7/8" NONTOXIC / ODORLESS Environmentally safe. FDA Cleared NOTE: Zerust NoRust Vapor Capsule will "yellow" paper over an extended period of time. Do not use in proximity of antique books, valuable documents, etc. Keep out of reach of children and pets. FAQ (Frequently Asked Questions) Zerust NoRust Vapor Capsule