A wooden pen with a black ebony wood shaft. Finished with beeswax, you can enjoy the aging process as you use it. Round shells are used as an accent. Inspired by guitar inlays, they are embedded and polished smoothly so there is no difference in level with the pen. You can choose either a ballpoint pen or a mechanical pencil for the metal fittings. Also, it can be sold without metal fittings. In that case, it will be 3,000 yen OFF from the listed price. The metal fittings compatible are Kato Metal Industries' 201 and 202.