Features: Slim and beauty your face: Activate facial muscles while exercising, increasing facial blood-flowing and oxygenation. Exercises will adjust your face and define your jawline. Suitable people: Suitable for beginners, intermediate, advanced and expert users (just 5-10 minutes of chewing practice per day to get a well-defined chin line). Anti-slip design: A special concave and convex texture pattern serves as a bite guide and forms a non-slip face, deep cavities keep the product fixed between the molars, and cores have a strong flexible silicone that makes it difficult to break. Exercise anytime, anywhere: The small size design makes exercise convenient and plan to use. When placed in the mouth at any time, easy to exercise. Tip: If you have any questions, please contact us, we will provide you with a satisfactory reply. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material:Silicone Size:2.5*1.6*1.6cm Package List: 1/3/4 Pair*Silicone Chin Masticators