1. CREATE YOUR GEMS: Make any stone shining and polish everyday rocks into dazzling gems, thanks to simple operation and design, this rock grinder kit makes it possible to turn rough rocks into beautifully polished gems, fun and easy 2. QUIETER THAN OTHER TYPE: The quality sander is built with a motor . The leakage proof rubber barrel reduces sound, making it 75% quieter than other plastic . 3. COMPLETE TUMBLER KIT: Contains everything you need to make polished gems, like 4 polishing grits, real rough gems, and a detailed full color study guide. 4. EASE OF USE: Simple instructions and one touch gears make gems grinding fun and easy. Control the number of days per rollover cycle with a one touch timer and auto off, set and forget it 5. Rock tumbler kit come with stable structure, excellent performance and long service life, Manufacturer: SOYWIM