Please refer to the self-introduction. A7 hard case is used. The window part is B8 size, for trading cards. Horizontal insertion type, with a key ring clasp. ※The image on the third page is an example of when a trading card is inserted, so the trading card is not included. Glue gun, adhesive, double-sided tape, etc. are used. Because this is a handmade product, there may be minor initial scratches or slight stains on the hard case, but please understand this before purchasing. In the unlikely event that a part comes off, please re-adhere it yourself. Thank you very much.