1. Food grade silicone: Food grade silicone is refined, safe, odorless, soft and elastic, not easily deformed, and has a long service life. 2. Tongue support design: Comfortable and easy to bite, effectively preventing masseter fatigue, and providing a better diving experience. 3. Universal interface: suitable for most diving breathing regulators, with a strap slot, which can be used in conjunction with a complimentary strap, making the connection more secure and tight. 4. Multi color options: Beautiful and colorful, fashionable and minimalist design, a good companion for snorkeling breathing tube equipment. 5. Underwater equipment: suitable for diving, scuba diving breathing, suitable for secondary head and breathing tube. Model Number: Diving Mouthpieces Main material of the product: silicone Product color: Blue,Red,Green,Pink,Yellow,,Gray,White,Black Color: Multicolor Material: Silicone Package Contents: 9 * Mouthpieces 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.