Rock Tumbling is a hobby that your whole family can enjoy! Tumbling is a simple way to polish agates and other gem stones. If you are truly interested in producing flawless gems through the tumbling process, this Model A-R12 Rock Tumbler is ideal. Deluxe, large 12 pound capacity hexagon rubber barrel. Quiet, efficient operation. Well-suited for the serious rock hobbyist. Features overload protection, continuous duty, fan-cooled motor.