MODEL TB-12 Our Tumble-Bee TB-12 comes with one 2lb capacity barrel. This model is the perfect size for professional tumbling of smaller materials such as stones, glass, and metals that need to be deburred and/or polished. MODEL TB-22 Our Tumble-Bee TB-22 comes with two 2lb capacity barrels. This model tumbles two barrels at once, which allows two people to use the Tumble-Bee at the same time or you can tumble two different grits/materials at once. Polish stones, glass and metals. MODEL TB-14 Our Tumble-Bee TB-14 comes with one 4lb capacity barrel. This model is the perfect size for professional tumbling of larger materials such as stones, glass, and metals that need to be deburred and/or polished. EASY TO USE Whether you are a beginner, a professional, or a kid looking to get into rock tumbling, our tumblers have a user-friendly design and easy-to-follow instructions, making it easy for everyone and anyone to use. With a compact size and safe operation, you can feel confident in your purchase of a Tumble-Bee. Non-slip Timing Belt Featuring a grooved design, this ensures the belt stays securely in place on the pulleys, resulting in a smooth operation. Constructed of durable polyurethane with added polyester fibers, the belt maintains its shape without splitting. Thermal Overload Protector The Tumble-Bee rock tumbler is equipped with a thermal overload protector, which automatically turns off the motor to protect both the device and the user in case of overheating. On/Off Power Switch The lighted power switch easily indicates if the Tumble-Bee is on or off, preventing you from plugging or unplugging before and after use. While this might seem like a no-brainer, many tumbler manufacturers skimp on this simple feature. Housing and Moving Parts The motor and pulleys are shielded with a motor cover for your safety. Made with hard ABS plastic, the Tumble-Bee rock tumbler housing is rust-free and has no sharp edges. TUMBLING SET Tumbling a rough rock into a polished stone is a self-rewarding experience. We designed our rotary tumblers with advanced features such as a thermal overload protector, a non-slip timing belt, a lighted power switch, shielded moving parts, and a rust-proof housing. The rock grit polishing kit is available as well.