Tru-square Metal Products Heavy Duty Rotary Tumbler with 15 lb Capacity Professional Grade Rotary Tumbler OUR most professional quality rotary tumbler features a 15 lb. capacity steel hexagon barrel with removable rubber liner. Used for a variety of tumbling and mixing operations: polish rocks, brass, and other metals. 115V heavy duty motor - fan-cooled with overload protection. The vendor offers a 5 year guarantee on barrel and liner. Extensively used by serious hobbyists, laboratories, schools, and industry, this model is the standard of hard-loading experts.