Welcome to my storeMaterial: The chin exerciser is made from food-grade silicone to ensure safety and non-toxicity. The polyurethane bite offers a customized mold for your mouth, allowing you to easily adjust the shape and mouth.Quantity supplied: 3 pieces (black*1 white*1 grey*1)Size: 3*1.3*1.1CMFunction: The chin exerciser trains and stretches facial and neck muscles, lifts muscles, draws a perfect facial line, helps reduce double chin, increases blood flow and oxygenation to the face, makes the face look younger and slimmer, shapes the face from all angles, strengthens the chin line and helps you achieve a perfect, natural smile.Effects of use: a muscular jaw strengthens the jaw, firms the face and neck and gives a more youthful appearance.Suitable training: bite down hard with your teeth for 10 seconds, feel the muscle strength, then release. Repeat 6-8 times a minute for 10-15 minutes a day. Don't chew too quickly, but clench your teeth firmly and feel the strength in your muscles.Anytime, anywhere: can be used at the gym, in the office or at home. Outdoors. We know how to train the body to get back into shape, so you'll want to train your face and neck muscles too.100% satisfaction - Our customers are our top priority. If you notice any problems with the product after you receive it, such as damage or incorrect quantities, please contact us immediately. We will do our best to provide you with satisfactory after-sales service."