1. Bring any stone to shine, polish everyday stones into radiantly beautiful gemstones, easy to handle and designed to last. With this electric scrub, you can turn rough stones into fine gemstones fun and easily. 2. The advanced grinder is equipped with a durable, longlasting motor. The leakproof rubber cylinder reduces noise and makes it 75% quieter than other plastic models. It can be a beautiful craft for children. During the operation, children can experience the joy of work and enjoy successful results, which can promote their curiosity and observation. 3. Our quality stone tumbler is made with a electric motor, allowing continuous and longlasting operation. The leakproof rubber cylinder with grinder is also wellsealed and quieter than others. 4. Our electric gemstone grinder is a fun and educational gemstoneloving toy for all ages, both children and adults. It is an gift for Christmas or Children's Day.