gevoelig bit zwart blauw 014 5It is made of an innovative, anti allergic plastic material instead of a heavy and or cold metal or metal allloy. Its slightly arched and flattened mouthpiece ensures that pressure on tongue, yaws and mouth corners, if applicable, is distributed evenly. The one piece design of mouthpiece and rings prevents a one sided squeezing or pinching of tongue or yaws, as well as painful irritations of the palate (no nutcracker effect). Additionally it enhances