Interestingly, all of the other style of pipe are identified by the shape of their bowls, but the churchwarden is identified by its long stem. The long stem can be bent or straight, but it is always very long - 9"-18" long. There is a practical limit to the length: you need to be able to reach the bowl with the stem in your mouth. The bowl size is usually small as compared to the average sized pipe. Churchwarden are available in clay and briar and occasionally meerschaum.