This blowpipe has an oval mouthpiece design with tips to hold the blowpipe in your mouth which prevents slipping and fits the mouth more naturally. It has a 3/8" bore, making it easier to blow your pipes. The built-in Little Mac is larger to prevent any restriction. It is attractive, light and durable and is compatible with all existing bagpipe designs. When you purchase an Airstream Blowpipe, it comes with an Airstream Mouthpiece. The Airstream Blowpipe comes in 5 different Lengths - 8", 9", 10", 11", 12"