Japanese-made mouthguard for Kendo, set of 2, size M Suitable for youth and child-sized men (13-bar and 12-bar mengane) Can also be used with Naginata, Jukendo, and Taiho-jutsu men 1mm thick, sturdy construction Made of polycarbonate, which is resistant to impact and cracking As a specialist in martial arts equipment, after various tests and monitoring, we found that thin 0.5mm or 0.3mm mouthguards are more likely to come loose from the men 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 mouthguards. Please remove the blue vinyl before use. Please comment if you wish to purchase multiple sets. We have plenty of stock, so immediate purchase is okay. A combination of adult and youth sizes is also acceptable (1 L, 1 M). Please specify your preference after purchase. 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, so please comment before purchasing. No discounts.