Gamo moisture cleaning cloth Cleans metal surfaces Safe for airguns, airsoft guns and firearms Removes fingerprints, which have acid that can eat through the metal's bluing...leading to rust and pitting 10"x10" If you don't wipe down the metal parts of your gun after each handling or shooting session, you may notice some rust on the metal the next time you pick it up. The fingerprints you leave on the metal surface of a gun have enough acid that it will eventually eat through the bluing of your gun. Once the protective bluing is gone, rust takes hold. Wipe down your gun before putting it away! The box mistakenly states that it lubricates metal parts. It does not. The cloth is not impregnated or coated with any substance that lubricates.