The SailorHocoro is a dip-style pen that allows you to write while dipping the nib into fountain pen ink. Unlike a typical “dip pen”, the tip of the pen has a pen point similar to a fountain pen, so the touch on the paper is soft and you can write fine letters and illustrations smoothly.These reservoir parts are made forthe Hocoro nib.It enables you to have a bit more ink on your nib. The reservoir part comes automatically with the 2.00mm calligraphy and Fude (brush style) nibs, but you can also add it to your F and 1.00mm calligraphy nibs.