This is the high speed heavy duty version of the Model B Thumler's Tumbler, using the 1/30 horse power 3000 rpm motor (drum speed of 40 rpm) to clean your brass fast when using ceramic, stainless steel, walnut or corn media! Do not confuse this high speed Model B Heavy Duty with the Model B tumbler using the slower and smaller motor. This is a heavy duty, professional quality tumbler, that features larger, more powerful fan cooled motor with overload protection. Steel hexagon barrel with removable rubber lining for long, efficient and quiet operation. 15 lb. capacity. 5 year guarantee on barrel and liner.