designed to precisely fit the individual diver's mouth, teeth, gums and jaw configuration to provide maximum support of a regulator Great replacement part for diving scuba snorkel . Mouthpiece bitten at small dots, easy to bite. Mouthpiece for the replacement of the old one. Suitable for 99% normal snorkeling snorkel. Diving essential supplies. If travel, rental of diving equipment, then we must carry with, to avoid the spread of disease. 100% silicone, non-, anti-allergy and anti-aging. Suitable for diving air bottles mouthpiece interface can also be connected with respirator. Size: 3cm x 1.2cm Colour:Transparent Material:Silica gel Package Contents: 2 x Diving Mouthpiece Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.