Turn rough rocks into polished gems: Discover and learn the fun process of rock tumbling with the Advanced Rock Tumbler. Pour in the rough stones and grit and let the machine do its job. Complete kit: Includes: rock tumbler machine, low-noise barrel (1 lb. capacity), 4 grit packets, 1/2 lb. assorted rough rocks, mesh strainer, jewelry fasteners, gem storage bag, and an illustrated easy-to-follow instruction and learning guide booklet. Powerful quality: Runs on a powerful heavy-duty motor that will last for a very long time, and includes a leak-resistant barrel that runs quieter than the other brands. Advanced features: Includes speed controls (providing more granular tumbling results), a 9-day timer (shuts off automatically when you desire), all displayed on beautiful LCD screens.