The PRO SERIES tumbler is the most advanced hobby tumbler ever created. Easy to use and designed for beginners, this heavy duty rock polisher features an upgraded motor for years of enjoyment, a 2-lb capacity leak-proof rubber barrel to reduce noise, a speed control system for faster and better polishing results and a shutoff timer to save electricity. You'll create brilliant, smooth gemstones for making handmade jewelry or displaying in your collection. It's a hobby that the whole family will enjoy! Includes an assortment of ready-to-polish rocks, four grades of polishing abrasives, jewelry settings and complete instructions.