Pipes can vary widely in shape and size as well as in complexity and functionality.  The most common and user friendly design is the classic spoon shape, however gandalf and straight one hitter designs follow closely. With the availability of so many variables paired with the added bonus of keeping your hands fairly smoke free, it's easy to see why this method of smoking has maintained its popularity.    A pipe consists of a bowl and a stem/mouthpiece. Often times the bowl will have a hole on the side of the pipe commonly referred to as a shotgun or choke. The shotgun allows for a burst of air to follow the smoke making for a smoother toke. Pipes come in a variety of not only designs but also materials such as; wood pipes, metal pipes, stone pipes, silicone pipes and the most popular of the materials being glass pipes.