Highly-polished stainless steel shot mixture of 3 mm ball/round shapes will burnish metals to a mirror bright finish in the minimum amount of time for almost all applications; it is the only shot combination you'll ever need! The stainless steel material is rust and corrosion resistant, able to handle up strong compounds, requires only occasional cleaning, and gives great uniformity. To be used with vibratory tumblers. Please contact us with any questions. Please visit our store for other great jewelry tooling items such as; Hand Stamps, Disc Cutters, Polishing Compound, Buffers, Hammers, Tweezers, Mandrels, Anvils, Vises and more! Thanks for Looking!