These clear auto-reverse rotary "barrel" tumblers allow you to see the tumbling process without opening the barrel lid. The bowls are constructed of heavy-duty acrylic with a water tight sealed lid to avoid any leakage during the tumbler process. Tumblers (Available in 3 sizes) feature auto-reverse function for thorough processing along with separate controls for cycle speed and duration of the tumbling process. Simply fill your tumbler to 50% with your choice of media (steel, stainless steel, ceramic, plastic) and then add water until tumbler reaches 75% capacity and finally, add your parts and you are ready to tumble! It is also recommended to add compound (depending on the media used) for a cleaner tumbling process. Replacement barrels are also available for each model. Dual voltage 110/220. Made in Taiwan.