Zerust Small Caliber Firearm 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 pistol barrels, rifle barrels and other small caliber firearms. The Small Caliber Prevention and Protection Tubing is ready-to-use and easy to install. Just simply cut and insert the desired length of the Rust Preventive Tube and Barrel Strip for Small Caliber Firearms 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 pistol, rifle, magnum and other small caliber firearm barrels from rusting. It will never leave a residue, is non-toxic and will protect your gun barrel for up to 5 years! Note: Cut the Small Caliber Firearm Rust Prevention and Protection Tubing longer so you won't forgot to remove it from the barrel. Tube Diameter: .20" Length: 150 Ft.