The Mini-Sonic Vibratory Tumbler, MT-4SV with 110V by Diamond Pacific Tool Corp. operates without shafts, belts, pulleys, eccentric weight or even a motor - so the MT-4 will far outlast other types of tumblers. The tumbler operates on a unique principle employing interrupted electrical current that provides vibration as the driving force powering the rotation of the load. Operating frequency is in excess of 3,500 vibrations per minute. You can tumble polish almost any kind of stone, from opal to topaz, delicate carvings and preforms, as well as metal items such as coins, jewelry findings, shell casings, etc. The unique tumbling operation is the key to the high performance of the MT-4SV. The vibratory motion is achieved without any moving parts. It improves the polishing process and uses only a small amount of abrasives compared to ordinary tumblers. Load capacity is approximately four pounds including stone, fillers, and abrasives. (Ceramic media is recommended for a filler but others to try are plastic pellets, corn cob, walnut shell, etc.) Control of the rotation and intensity of the tumbler operation is accomplished with solid state electronic controls. The mini-sonic vibratory tumbler is also available in 220V, or an export model. The cast ABS plastic hoppers give exceptionally long wear. With no motor, belts or pulleys to worry about, you have a tumbler built for years of worry free service. Complete with manual and instructions on recommended grit procedures. The average length of time for tumbling agate is two to three weeks. Shipping weight 11 lbs. FOB, Powell, WY