Premium Argentium Silver Fountain Pen - Black AbaloneBlack Abalone a pen made from material created in house It features a polished steel Jowo nib size 6 and comes with a Schmidt K5 ink converter. Other nib sizes are available upon request. The pen measures approximately 145m m long including the cap, 135m m from nib to body end, and has a body diameter of 15m m with a 14m m thread. The cap diameter is 16m m. The silver used in this pen is Argentium . 940, which is whiter and brighter than traditional .