Feature:1. CREATE YOUR GEMS: Make any stone shining and polish everyday rocks into dazzling gems, thanks to simple operation and durable design, this rock grinder kit makes it possible to turn rough rocks into beautifully polished gems, fun and easy2. QUIETER THAN OTHER TYPE: The quality sander is built with a durable motor that's built to last. The leakage proof rubber barrel reduces sound, making it 75% quieter than other plastic models. A great DIY activities for kids3. 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. A great gift for girls and boys4. EASE OF USE: Simple instructions and one touch settings 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 it5. STABLE AND DURABLE: Rock tumbler kit come with stable structure, excellent performance and long service lifeSpecification:Item Type: Rock Tumbler KitModel: HS-403Material: ABS, metal.Package List:1 x Host1 x Roller1 x Stone Bag(random style and color)(inside the roller)1 x Power Adapter4 x Sanding Grits1 x Glue1 x Wheel Belt1 x Accessory Bag(1 large key ring, 1 small key ring, 1 necklace, 2 ring circle, 3 stone buckles, 2 pins)1 x User Manual