Introducing a new collaboration pen case between dünn and the pen case "Ruuno" . The cuteness of the pouch and the luxurious feel of the leather create an exquisite balance that creates the look of an adult pencil case. The outside is made of Himeji leather with a nice grained texture, which was also used in the dünn glasspen box, and the interior, where the pen goes, is made of Ecsaine, a material that is easy to store, making it pen-friendly. It is possible to store not only pens but also stationery, rulers, etc.