Product description Material: Silicone Size: 3.5*3.8*4cm Color: black, blue Resistance: 30lbs, 40lbs, 50lbs Package Contents: 1*Muster training ball 1*lanyard 1.High-quality materials Our jaw trainer is made of food-safe organic silicone to ensure safe use. The chew part can be disassembled and cleaned. It is not a disposable product and can be reused after cleaning. 2.Tighten and strengthen the lower jaw Our lower jaw training device is an ideal tool for lifting and toning the lower jaw. Training eliminates fat deposits around the chin, cheeks and neck and promotes toning of the facial muscles, thus contoured your face. 3.PlasticityLift the muscles and shape the perfect facial line. The jaw trainer trains and stretches the muscles of the face and neck, reducing the double chin, strengthening the chin and achieving a perfect and natural smile. 4.Portable and easy to use Due to its small size, it can be easily taken with you when going out and trained anywhere. It is also very easy to use, just put it in your mouth and exercise. 5.Resistance With a resistance of 30 to 50 pounds, this small, device will make your face and neck visibly tighter and more youthful. Exceptional results can be achieved with just 20 minutes a day.