CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This starter rock tumbler makes it fun and easy to turn rough rocks into beautifully polished gemstones, thanks to its simple operation and durable design. A TUMBLER THAT'S MADE TO LAST - The durable motor allows you to tumble multiple batches of rocks. An improved, leak-proof barrel is lined with rubber for quieter operation while tumbling on the sturdy tumbler base. ALL-IN-ONE TUMBLING KIT - This kit has everything you need and then some! You get ư a pound of rough rocks with nine different types of gemstones inside, five jewelry fastenings, and our four-stage rock polishing grit. EASY TO USE AND EDUCATIONAL - Detailed tumbler instructions lead you step-by-step through the rock tumbling process, A full-color learning guide details how rocks are naturally polished and has fascinating facts about the gemstones in the kit. SATISFACTION GUARANTEED ? The National Geographic STEM series provides kids high-quality educational toys that are a whole lot of fun! If your experience is anything less than extraordinary, let us know so we can make it right for you.