Tumbling is easy and effective with the Diamond Pacific MT-10 Mini-Sonic Vibrating Rock Tumbler - 2 Hoppers. Uniquely built to avoid many of the problems of traditional tumblers, this machine operates via electronic vibration. An interrupted electrical current moves the contents of the hopper only - not the machine itself. A lack of pulleys, belts, and motors means it lasts longer and is quieter and easier to use. Just control the settings via an electronic dial. The Mini-Sonic operates with 3600 vibrations per minute on 60Hz of power, and comes with two hoppers, each holding approximately 4 pounds of material. An alternating separation and compaction process draws fresh abrasive up into your materials and forms a slurry that coats and polishes. Only a small amount of water and abrasive is required for operation. Too much of either will cause material to collect in the hopper and prevent proper rotation. About Diamond Pacific For over 30 years this second-generation family-owned business has manufactured equipment for lapidists - from rock hound hobbyists to professional gem cutters and jewelers. Diamond Pacific hopes to put fun and pride into the craft by manufacturing the necessary tools to ensure superior results. * Two 4-lb. capacity hopper * Cast polyvinyl hopper * Durable ABS plastic housing * 60Hz; 3600 vibrations per minute * Alternating separation/compacting action * Rotation and vibration powered by electric current