Thumler's Tumbler replacement or extra barrel plus lid for the UV-10 Industrial tumbler is available, part number 209 IN.  The barrel for Thumler's Tumbler ultra-vibe vibratory tumbler holds 3 quarts for rock tumbling or case polishing and is a heavy polyethylene bowl. When polishing rock many feel a barrel just for the polishing stage is worth the expense for a better polish. Shipping weight is 3 pounds.