Factory direct, produced from High Quality, Healthcare grade, Class VI Silicone Rubber our Long Bite Scuba Mouthpiece helps reduce jaw fatigue by allowing divers to vary their bite during the course of the dive. The mouthpiece breathing hole is compatible with most regulators (1.1 x 0.5 inches). Mouthpieces are available in four colors: Yellow, Clear/Translucent, Black and Orange. Mouthpieces sold Bulk: 25 to a bag, one color per bag. All of our products are injection molded at our ISO Certified factory in Sanford Maine, USA.