To all ARMYs who love BTS! This is a limited edition item released by the Japan Post Office! It sold out quickly and is extremely rare!! I searched many post offices to buy it. I've kept it in a plastic sleeve. 11cm x 15cm No longer available A valuable item, so please consider it if you're interested. The material is vinyl. The design is cute. Available at 400 post offices nationwide. *For details on the post offices that carry this item, please see the following: Japan Post Office Goods Sales Co., Ltd. Limited quantity. BTS Bulletproof Boy Scouts BT Ishibil BT21 No price reduction.