It is a matte black color of the "cap-less" knock type fountain pen series. . . It is a highly practical model that can be immediately started writing as Wan'nokku knock type ballpoint pen. There is a sense of stability because there is a moderate weight that looks like a solid, nib in 18K, writing taste is smooth. . . In Wan'nokku, when storing the pen tip will prevent ink leakage and drying airtight shutter mechanism. . . ◎ with Capless series. Knock as the world's first fountain pen was developed and commercialized the pilot, since its launch in 1963, over a half-century long-selling products. .