1. Stone Cup Set Polish Your Gemstones : Rocktumbling is an extremely popular hobby for children and adults! This professional stone glass is fun and easy to turn rough rocks into beautifully cut gems thanks to its easy operation and durable design. The tumbler set makes the drum even easier in an interesting way to transform any raw stone and polish it into super shiny and gorgeous gemstones.Timing function: the durable motor has a time control setting, so you can configure it and don"t worry if you forget it. 7-day digital timer (with automatic shut-off function), you can set and repeat it according to your needs, while you want to have your own beautiful gemstone, requires a lot of time to grinding and polishing, so it takes time and patience. Size: 21 x 14.5 x 16.6 cm.2. Have fun DIY : Children can collect different rocks outdoors and turn them into beautiful and attractive stones. During surgery, children can experience the joy of work, enjoy the feeling of success and promote their curiosity and observation. Detailed instructions on the glass guide you through the drumming process step by step, includes fascinating facts about the gems in the set.3. FUNNY GIFTS FOR ALL AGES : Rock Tumbling is not only a rocky glass for kids, but also a rocky glass for adults, making it a fun and high quality craft tool for kids and families. Surely the perfect gift for Christmas, Children"s Day. A stone grinder can improve children"s interest in geography and science and train children"s patience.Easy to use: Rock tumbler kit is easy to use and very suitable for beginners, and the instruction manual in the educational play set contains detailed instructions on the operating process of coarse stone grinding. Package: 1 x rock tumbler, 1 x raw stone (in the roller), 4 types x (coarse grinding, fine grinding, polishing, final polishing) polishing powder, 2 x ring rings, 1 x necklace + gemstone holder, 1 x key ring chain, 1 x leather strap (replacement), 1 x power cable with Euro plug, 1 x English instructions.