This is the smallest vibratory tumbler we have. This is a single 2.5 pound bowl & lid with a vibratory drive unit. Tagit tumblers are famous for their quiet operation and long-lasting parts. We recommend that you use one bowl for the Silicone Carbide powders and a separate bowl for your polish powders, as the SiC tends to embed in the plastic bowl. Consider running up to a maximum of three bowls at once with this unit. Order a Piggyback Unit below for each bowl you want to add.