Birchwood Casey Treated Chamois Gun Cleaning Cloth is the perfect for helping to protect gun barrels, metal gun parts, and accessories from rust, dirt, or residue left by handling. The 11\” x 14\”, cloth is pre-treated with a non-abrasive oil that can protect the firearm while not causing and scratching or damage. Although primarily meant for metal surfaces on firearms, the cloth will also protect knives and other metal surfaces.