Silicone mouthpiece for more comfort. 

MP-900 scuba mouthpiece has a revolutionary design that incorporates multiple ergonomically designed raised Crayton rubber cushions on the bite tabs to provide additional comfort, less jaw fatigue and a more pleasant dive experience. Scuba mouthpieces generally feature short bite tabs and are made of a soft material to accommodate use by a wide range of jaws and teeth; this requires forward movement of the jaw to effectively grip the scuba mouthpiece. This scuba mouthpiece really makes a difference in the quality of your dive!