The Airstream Mouthpiece is the same mouthpiece that comes as standard on all Airstream Blowpipes. It has an oval shape to allow for more airflow to your pipe bag. This is essential for the large bore blowpipes, as the bore size will not matter if the mouthpiece does not allow the maximum airflow. All mouthpieces come with a mouthpiece protector on them. Although these blowpipes are standard on all Airstream Blowpipes, they are threaded with a universal fit so they will fit most makes of blowpipes.