Kendo Mouth Guard Made in Japan - Size L Suitable for adult men (14-bar face guard) Can also be used with Jukendo, Naginata, and Taiho-jutsu face guards Made with a sturdy 1mm thickness Material: Polycarbonate, which is resistant to impact and cracking As a specialist in martial arts equipment, we've conducted various tests and monitored user feedback. We found that thinner mouth guards (0.5mm or 0.3mm) are more likely to come loose from the face guard upon impact or break during removal. (Thickness is important; please check the thickness when purchasing.) This product is made with 1mm thick polycarbonate, which we've determined is the optimal 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 you can buy immediately. Shipping will be via standard mail, so it will take approximately 3-5 days for delivery. Please note that standard mail does not deliver on weekends and holidays, so delivery may be delayed if it includes weekends or holidays. If you need faster delivery, we can change the shipping method for an additional fee. Please comment before purchasing. No discounts.