You can get a complete set of rock drum kits, which includes all the tools needed to polish stones: one rock drum, one pound of gemstones (9 different types), four polishing abrasives, jewelry fasteners, one tube glue, and a detailed full-color learning guide.Our high-quality rock drum is made of high-quality motors, which are durable and can work continuously for a long time. In addition, the leak proof rubber bucket equipped with the grinder has good sealing performance and is quieter than other products.Easy to use: Rock rolling is a very popular hobby for children and adults! This entry-level rock roller, with its simple operation and durable design, can easily and interestingly transform rough rocks into exquisite polished gemstones.The perfect gift for all age groups is not just a children's rock cup, but also an adult rock cup. Our rock tumbler science kit is a fun and educational gemstone hobby toy that is suitable for all ages, children, and adults who will be fascinated by it. This is definitely the perfect gift for birthdays, Christmas, Children's Day, and New Year.