The Heavy Duty tumblers utilize heavy gauge steel construction, 100% rubber barrels (tumblers), and are built for rugged 24-hour a day use. Proven to be one of the most effective ways to clean even the clad coins you recover. Heavy duty tumblers come in either a single barrel or a double barrel configuration. Simple to use - covered by a full year warranty. Single Barrel Clean up to 100 coins at a time! Heavy Duty 3 lb. capacity rubber barrel tumbler. 115V continuous duty motor - impedance protected. Ideal for all types of coin cleaning & polishing.