Dual-Drum Rotary Rock Tumbler delivers a smooth, polished finish on rocks, semiprecious stones, glass, and metal. This quiet low-speed tumbler is designed to run for days at a time, ensuring a lustrous finish Generous 6 lb. capacity Rubberized barrels for quieter operation Fan-cooled, V-belt driven motor Can be used with all types of tumbling media including ceramics, resins, nut shells, and glass beads