Bowl Shape and Motor - The Model 400 bowl has a thick, rich wall material that's molded into a smooth, rib-less, ovoid shape. This shape produces the smoothest and fastest vortex tumbling action. The motor is equally tough and reliable... And it's got a THREE YEAR WARRANTY to back it up.Huge Tumbling Capacity - The Berry's Model 400 tumbles up to 1,000 pieces of 9mm brass, 600 of 45 ACP, 450 of .223 Remington, and 250 of 30-06.Tumbling Kit #2 - Along with the Berry's 400 tumbler, you get 6 lbs. of corncob media, brass polishing media additive, and Berry's completely enclosed, high capacity Rotary Sifter. The enclosure keeps corncob from spraying all over the room when you crank the handles... Pretty smart design! For more information on tumblers, see our Berry's Tumbler Page.