Thumler's Tumblers are heavy duty tumblers that will last a lifetime. The professional quality tumbler is built strong to last. They feature a heavy-duty motor, steel hexagon barrel with removable rubber lining and efficient and quite operation. The Model B is perfect for reloaders looking to use a liquid media or even stainless steel tumbling media, but will work equally well with dry media. Barrel Inner Dimensions: 8" x 7-1/2" x 6-1/2"Notes: The motor turns at 3000 , turning the barrel at 40