This is a hand-stitched, genuine leather business card/card holder for an M5 system planner. The main body is made of Tochigi Leather in yellow, and the pockets are made of Tochigi Leather in black. It is hand-stitched with yellow Vinymo thread, and the edges are burnished with Tokonole. To ensure that the binding holes are not blocked even when cards or business cards are inserted, the width is about 8mm wider than the M5 refill. I don't think it will stick out from the planner cover, but please check before purchasing. *This item is also listed on other sites. Please note that your order may be canceled if it sells out quickly on another site.