Different size mouthpieces are available for the bagpipe. This way you can alter the length of the blowpipe on your pipes without having to buy a new blowpipe. These mouthpieces are made of Delrin, so they are strong and will last a long time. They will fit on most blowpipes. 5 sizes in total are available 2 1/2″, 3″, 4″, 5″, 6″. A proper fitting blowpipe will help with your posture when playing your bagpipe.