Description: Food grade PVC material,BPA free, non-toxic,environmental friendly and comfortable. Groove fit the surface of the teeth,convenitent to keep breathing smoothly. Easy to fit and molds to teeth and gums, providing a comfortable fit for extended use. With internal shock-absorbing frame for ultimate protection. Suitable for all contact sports such as football, basketball, lacrosse, hockey, MMA, boxing, jiu jitsu and much more. Specification: Material:Food Grade PVC Size: One size, approx. 6.5 x 5cm/2.6x 1.97 inch Thickness: 18mm/0.7inch Color: Black/Blue/White How to Use: Step 1: Please put it in 80 degree hot water about 25 seconds until it becomes soft Step 2: Take out the gum from the hot water by sticks/forks and then Put on the guard to take shape Step 3: To memorize your mold of teeth, bite it 10~15 seconds Step 4: Put the shaped gum to cold water to make it solid (you can trim it if it is too long ) It can be re-shaped if it doesn't fit well at the first time Package Includes: 1 Piece Mouth Guard Note: Please caution the hot water when you soften it especially your kids Please keep it clean and disinfect it after using it