[Grinding Your Own Gems] Rolling stones are a very popular hobby for children and adults This professional rock tumbler makes tumbling easier in a fun way, turning rough rocks into beautifully polished gems.[Easy to Use] You can set any grindstone time from 1-7 days with a button, or you can stop and continue working with one button. After finishing the set working time, the stone grinder stops automatically. The leak-proof rubber bucket reduces sound and the overall noise is 75% lower than the plastic tumbler bucket. [Educational and Science Toys] Kids can collect all kinds of stones outdoors and grind them into attractive diamonds by machine. In the process of grinding, they can cultivate their curiosity and observation, and children can also experience the fun of labor. [Durable Polishing Machine] Our polishing machine adopts high-quality motor, which is durable and can work continuously for a long time. Suitable for kids DIY Activities. [Perfect Gift] This is a science education kit for all genders and ages that develops a love of science, geology and mineralogy in a fun and exciting way. Perfect for birthday, Christmas and other holiday gifts.Detailed Name: Rock Tumbler Kit Product Material: ABS, metalProductApplicable Age: 8+Voltage: 100-240VColour: blackNotes:1. Due to the difference between light and screen settings, the color of the item may differ slightly from the pictures.2. Please allow for slight measurement deviations due to manual measurements. [Grinding Your Own Gems] Rolling stones are a very popular hobby for children and adults This professional rock tumbler makes tumbling easier in a fun way, turning rough rocks into beautifully polished gems. [Easy to Use] You can set any grindstone time from 1-7 days with a button, or you can stop and continue working with one button. After finishing the set working time, the stone grinder stops automatically. The leak-proof rubber bucket reduces sound and the overall noise is 75% lower than the plastic tumbler bucket. [Educational and Science Toys] Kids can collect all kinds of stones outdoors and grind them into attractive diamonds by machine. In the process of grinding, they can cultivate their curiosity and observation, and children can also experience the fun of labor. [Durable Polishing Machine] Our polishing machine adopts high-quality motor, which is durable and can work continuously for a long time. Suitable for kids DIY Activities. [Perfect Gift] This is a science education kit for all genders and ages that develops a love of science, geology and mineralogy in a fun and exciting way. Perfect for birthday, Christmas and other holiday gifts.