High-quality Materials: Our jaw exerciser is made of food-grade silicone and polyurethane. It is safe to chew, non-toxic, elastic, not easily deformed, light and durable. Before and after each use, please wash with hot water to ensure cleanliness and safety. Perfect Jaw Shape: Maxillofacial training equipment can exercise 57 chewing muscle groups on the face. The jawbone training device has a bite resistance of 30 pounds, which can reduce excess fat in the jaw, strengthen muscle lines and promote metabolism. Product Function: This chin exerciser adopts a safe and unique design, which can tighten the muscles of the face and neck, making your face shape clear, youthful and elastic, and can also increase muscle blood circulation. How to Use: Repeat at least 30-40 times a day, then start four sets, repeat 150 times a day. Through targeted training, it can correct the shape of the face, tighten the chin, rejuvenate the face and delay aging. . Lightweight and Practical: The lightweight and portable design makes this jaw exercise ball easier to carry. It can be used in the gym, office, home or travel without boiling or installation. Enjoy the fun of fitness at any time Specification: Material: Silicone Size: 48 x 32 x 42mm / 1.9 x 1.2 x 1.6inch Color: Blue, Black Quantity: 2 Package Includes: 2 x Jaw Training Device