This sturdy, economical rotary / rock tumbler from Thumler's Tumblers has two 3 lb. capacity molded rubber barrels, each with a fifteen-sided interior, for a total capacity of 6 lb. The continuous duty motor is fan cooled and has overload protection to prevent overheating. Molded hard rubber barrels are 4” inside diameter x 4” deep. For tumbling jewelry, rocks, sea glass, and other items with wet or dry media. 110 Volt, Made in USA.