Easy to use and designed for beginners, this heavy duty rock polisher is no toy. With a three-pound-capacity tumbler, sound-muffling rubber barrel, solid metal frame and 115V continuous duty motor, 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! The Rock Polishing Kit comes with a ¾-pound assortment of ready-to-polish rocks, four grades of polishing abrasives, jewelry findings and complete instructions. The Rock Tumbler Refill Kit includes extra grit and rocks for more polishing fun.