Tough metal requires tough cleaning. Supercharge your media’s scrubbing power with Tumbler Media Additive! Will not harm any metal or primer and will not stress brass. No Ammonia, no buildup. Flitz Tumbler Media Additive is suitable for corn cob, walnut, and several other types of media. Cuts tumbling time in half and cleans, polishes, and protects brass & nickel. Flitz Tumbler Media Additive is an eco-safe product.