Let's rock and roll! Transform rough stones into beautiful polished gems while exploring erosion, weathering, and the geological rock cycle. Includes natural rock samples like tiger's eye, aventurine, and rose quartz, plus four polishing grits and jewelry settings to turn your finished specimens into accessories. The durable motor and built-in timer support tumbling runs up to seven days, with capacity for 450 grams of material. For Ages 8 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.