Flitz Tumbler/Media Additive works with your tumbler to safely clean and polish all metals. The eco-safe formula is ammonia-free, so it won't stress brass or damage primer. Flitz Tumbler/Media Additive is designed to remove oxidation, tarnish, lead build-up, and fingerprints, and prevent future build-up. It's ideal for silver, nickel, brass, copper, and more. Cut your tumbling time in half - simply use 1 ounce of eco-safe Flitz Tumbler/Media Additive per pound of media for beautiful results every time.