Builtin motor and quiet operation The grinder is built with a motor for reliable powered use. The leakproof rubber barrel reduces noise, making it about 75% quieter than other plastic models. Designed to support ongoing gemstone polishing projects with steady performance. Easy to use and control Simple instructions and onetouch settings make grinding gems easy and enjoyable. Onetouch timer and automatic shutdown provide setandforget convenience for consistent results. Complete polishing kit Includes everything you need to make polished gemstones: 4 grinding grates, real rough stones, and a detailed fullcolor study guide. The kit supports a straightforward workflow from rough stone to polished gem. What you can do with it (use scenarios) Home gemstone polishing: turn rough stones into beautifully polished gems for DIY jewelry, display pieces, or gifts. Kids crafts and learning: a userfriendly setup that enables kids to create polished stones while learning about gem polishing through the study guide. Hobbyist projects and demonstrations: reliable onetouch controls and repeatable results for hobbyists, makers, or classroom demonstrations. Key attributes and performance Function: electric grinder designed to convert rough stones into polished gems. Material and construction: leakproof rubber barrel for quieter operation; motordriven grinding system. In the box: 4 grinding grates, real rough stones, detailed fullcolor study guide. Size and compatibility: designed for home and educational use with a compact, allinone kit format.