The 40 pound capacity tumbler, mod. #268TUM, by Covington Engineering is a commercial size 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. The barrel turns on rubber covered roller shafts. The production tumbler Model #268 is a quiet running tumbler and comes with belt guard, instructions and guarantee. Size 24"L X 24" W X 15" H. Shipping weight for the two packages is 85 lbs. Barrel size is 16" X 14" W X 14" H. A recent question asked was how large of a stone would be possible to polish in this tumbler, and a 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. (Shipping weight of barrel-30 lbs.) FOB Redlands, CA.