The 40 pound capacity tumbler, mod. #268TUM, by Covington Engineering is a commercial size tumbler for extended heavy use. Features for this rotating tumbler: forty pound capacity, heavy hexagonal barrel with rubber liner, steel chassis and support shafts, heavy duty ball bearings, neoprene sealed, 1/3HP, and 110V, 60Hz heavy duty motor. Inquire about the Export model (2682TM) 220V, 50Hz motor, at $975.00, minus discount. The barrel turns on rubber covered roller shafts. The production tumbler Model 268TUM is a quiet running tumbler and comes with belt guard, instructions and guarantee. Dimensions: 25″ x 25″ x 16″, & 16″ x 16″ x 16″. Shipping weight for the two packages is 84 lbs. (barrel ships separately 27 lbs.) pounds. Barrel size is a 9″ opening X 10″ width x 12″ depth. A recent question asked was how large of a stone would be possible to polish in this tumbler, and one softball size was noted by the manufacturer. This stone would be surrounded by many smaller stones, from 1/4″ on up. Check Lapidary Tips for tumbling articles to see recommended tumbling procedures. FOB Redlands, CA.