Kendo Japanese-Made Mouth Guard - L Suitable for adult men (14-bar face guard). Can also be used with face guards for Jukendo (bayonet fencing), Naginata (Japanese halberd), and arrest techniques. Made with a sturdy 1mm thickness. The material is polycarbonate, which is resistant to impact and cracking. As a martial arts equipment specialist, after various tests and monitoring, we found that thinner mouth guards (0.5mm or 0.3mm) are more likely to come loose from the face guard due to the impact of strikes, or to break during removal (thickness is important; please check the thickness when purchasing). This product was created after determining that 1mm thick polycarbonate is the most suitable material for mouth guards. Please remove the blue vinyl before use. For multiple purchases: From the second piece onwards, the price is 400 yen per piece. We have plenty of stock, so immediate purchase is okay. Shipping will be via standard mail, so it will take approximately 3-5 days for delivery. Furthermore, standard mail does not deliver on weekends and holidays, so delivery will be further delayed if weekends or holidays are involved. Thank you for your understanding. If you require faster delivery, we can change the shipping method for an additional fee. Please comment before purchasing. No discounts.