The Airstream blowpipe has an oval mouthpiece design with tips to hold the blowpipe in your mouth which prevents slipping and, for some, fits the mouth more naturally. It has a 3/8″ bore (the larger bore generally makes the pipe easier to blow). The air valve is built-in the blowpipe. It is light, durable and is compatible with all current bagpipe designs. The Airstream mouthpiece is included. The Airstream Blowpipe comes in 5 different Lengths: 8″, 9″, 10″, 11″, 12″