SAILOR Fude de Mannen Fountain Pen - 55 Degree Nib - Green (excludes converter)This pen is popular with urban sketchers becaue of the ability to experiment with line width. Works well with SAILOR KIWAGURO permanent (waterproof) ink. The SAILOR Calligraphy Pen has a special curved nib (curved upwards at 55%) that gives variation in line width. You get a finer line with the pen held in a more vertical position and a wider line as you decrease the angle of the pen to the page. It takes some practice to use the pen, but it makes you