This is the Duct premium pen case from SEASAR, a brand by the stationery YouTuber, Mr. Seasar, the king of stationery YouTubers. It uses Marugofog leather. Marugofog is cowhide leather that has been vegetable-tanned and topped with white wax. As you use it, the white wax becomes transparent, and the leather develops an overwhelming luster. This pen case has only been used for about two months, so I think it will develop a wonderful shine from here on out. The inside is made of Ultrasuede, a high-quality artificial suede. There are some marks from clips and rulers that were stored inside. Please refrain from purchasing if you are concerned. I think this pen case is the only one that has a pen holder that can hold four thick pens, despite being very compact. I am very sorry, but I am not considering lowering the price. Thank you for your understanding. [Search words] Stationery, pencil case, pen case, Seasar, SEASAR