This Lortone tumbler has a single 3-pound capacity barrel and a drive motor. Has a very good leak-proof lid-retainer system. A good starter tumbler for those who want a little more than the minimum (3-Lb) capacity. Great for small loads, and while you are learning--same polish quality as the others. Economical in it's use of electricity and powders. A good brand with a good reputation. Note: this unit is brand new and carries a full manufacturer's warranty.