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. Specification: Origin: Mainland China Model Number: Diving Mouthpieces Main material of the product: silicone Product color: (optional)Blue,Red,Mint Green,Purple,Dark Gray,White,Black Product size: 5.4 * 5.1 * 3.6cm/2.13*2.01*1.42inch Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement.