Zerust Gun and Rifle Barrel Rust Prevention and Protection Tubing beats the mess of using gun oil hands down! This product is effective and an affordable rust protection solution . It is perfect for rust prevention on gun barrels, rifle barrels or lengths of stored metal pipe. The Firearm Prevention and Protection Tubing is ready-to-use and easy to install. Just simply cut and insert the desired length of the Firearm Rust Prevention Tube and Barrel Strip inside the metal tube, pipe or barrel, and cap the ends. The air inside of the pipe is protected with vapor corrosion inhibitors and protects your gun and rifle barrel from rusting. It will never leave a residue, is non-toxic and will protect your gun and rifle barrel for up to 5 years! Note: Cut the Zerust Gun and Rifle Barrel Rust Prevention and Protection Tubing longer so you won't forgot to remove it from the barrel. Tube Diameter: .250" Length: 200 Ft.