Product name:jaw exerciser Product size about : 5.3*4.9*2cm/2.1*1.9*0.8in Product color: As shown in the figure Product material:Silica gel product features: 1. High-quality and safe materials: Our jaw trainer is made of high-standard safe silicone material, en, harmless and safe for the human body. You can use it with peace of mind without worrying about the impact of harmful substances on your health, and it is suitable for long-term use. 2. Comfortable fit design: The silicone material of the jaw trainer is soft and elastic, which can perfectly fit your oral structure and provide a comfortable wearing experience. Whether it is daily training or special exercises, it can effectively train your jaw muscles. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Shipment includes: 1 pc jaw exerciser