4 Brand New Mouth Guard. The size is L but the measurements are in the pictures. Fits Youth, just depends on size. 

• Simple molding process to fit perfectly for any mouth within the measurement limits. 
• Important Notes: These sports mouthguards don't fit everyone, please check the size carefully before purchasing. Not to be used with teeth braces/retainers. The mouthguard strap can be pulled off and cannot be put back on after it is pulled off.
• Repeated Molding: If the mouth guard does not mold well, you can repeat the boiling and biting process. Please be careful of burns during the process.
• Effective Protection: Food-grade EVA material, internal gel padding, and a shock-absorbing exoskeleton frame provide excellent protection.
• Package Includes: The product includes 6 mouthguard and a single storage box with a carabiner, enough for daily use and replacement.
• Wide Range of Application: The mouthguards are suitable for all contact sports where sports mouthguards are required or recommended, including football, hockey, boxing, MMA, wrestling, basketball, etc.

No Returns, so be sure the measurement and fit are correct. 

WARNING: Be careful when you mold it, it should be hot, but don't over boil it or it could burn you or compromise the guard if you overheat it. It's a simple process that can be redone if needed. Clear instructions are in the pictures as well. 

Thanks