Details: You will receive two face masks, one blue and one black, each with an 18 cm long strap with 3 holes. It can be connected to the mouth guard so you can hang it anywhere. Safe material: mouthguard is made of food-safe EVA material, which provides you with excellent shock absorption protection. Three-layer design: football mouth guard adopts a three-layer design. Includes gel fitting lining and shock-absorbing exoskeleton frame, it can provide full mouth guard in strong impact. Use: place it for approx. 45-55 seconds in warm water at approx. 75C until it becomes soft. After softening, insert it into the teeth in the mouth. Bite it for 40 seconds and then put it in a bowl of cold water for ten seconds. 3. If the mouth guard is suitable for your mouth, please wash it with water and use it. If it does not fit in your mouth, you can repeat step 1. Suitable for various sports: this mouth guard with thickened bottom can protect chin and teeth, suitable for rugby, boxing, martial arts, hockey, MMA, taekwondo and can prevent mouth bites.