CREATE YOUR OWN GEMSTONES - This rock polisher kit makes it fun and easy to turn rough rocks into beautifully polished gemstones, thanks to its simple operation and sturdy design. A TUMBLER THAT'S MADE TO LAST Our tumblers are made with a sturdy motor The leakproof rubber barrel reduces sound, making it 75% quieter than other plastic models. ALL-IN-ONE TUMBLING KIT - This complete kit has everything you need to create polished gemstones. In addition to the tumbler, four polishing grits, sifter, and rough gemstones, Learn all about the gemstones in your kit with the detailed, full-color learning guide. EASY TO USE Simple instructions and one-touch gears make rock tumbling fun and easy. Control the number of days for each tumbling cycle with the one-touch timer and automatic shutoff feature, so you can set it and forget it. This is a great gift for kids!