The Weber Smokey Mountain (WSM) is a bullet smoker. It is popular with the backyard cooker as well as used on the competition BBQ tours.
WSMs use charcoal as the fuel and wood chips or chunks for providing the flavoring smoke. A water pan sits above the fire to keep the air in the smoker moist and to help regulate temperature.
The Weber Smokey Mountain comes in two sizes: 18.5″ and 22.5″.