Food grade EVA material, 100% BPA free, non-toxic and Easy to fit and molds to teeth and gums, providing a comfortable fit for extended use With internal shock-absorbing frame for ultimate protection Integrated breathing channels make it easy to breathe and maximize performance Suitable for all contact sports such as football, basketball, , hockey, MMA, boxing, jiu jitsu and much more Specification: Material: Food Grade EVA Size: One size, approx. 4.8 x 5cm / 1.89 x 1.97 inch Color: Black/Purple/Blue/Rose Red How To USE: Please make it for fitting from your teeth as follows Step 1: Put it to cup of warm water (70 to 80) till soft for about 10 seconds Step 2: If it is soft, insert it to your upper teeth in mouth Step 3: To memorize your mold of teeth, bite it 10~15 seconds Step 4: If it is fit to your teeth, clean it with water and use it If it is not fit to your mouth, you can fix it again from step 1 Package Includes: 1 Piece Mouth Guard (2 Pack) Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different batches and different monitor. Thanks!