Hoppe’s Black High-Performance Copper Cleaner is formulated with high round count firearms in mind but is suitable to use on any firearm bore. This copper cleaner is a superior formula engineered to remove high amounts of stubborn copper fouling from any firearm bore after a long day out at the range.Suitable to use on any firearm boreFormulated to remove high levels of copperMade in the USAAvailable in a 4 oz bottleStep two of the Hoppe’s Black Five Step Cleaning System