Model 3A Single 3 lb. capacity barrel. Base dimensions: 6'W x 9.5' L 3 lb Barrel ID: 4-1/8' Depth, 3-7/8' Dia The Lortone 3A rock tumbler features a patented rubber barrel with quick-seal cover and a powerful continuous-duty electric motor. The tight-sealing rubber barrel not only produces beautifully polished pieces but provides extra sound absorption for quieter operation. It's capable of running 24 hours per day for years. A rotary tumbler has the advantages of removing all the rough edges to produce nicely rounded corners and also is suitable for tumbling hard minerals. It typically takes 4-6 weeks to completely polish a batch of rocks. One year warranty from Lortone.