PARALLEL CALLIGRAPHY CONVERTIBLE CALLIGRAPHY FOUNTAIN PEN A new breakthrough in calligraphy pen design. The Parallel Pen is designed with a nib that consists of two parallel plates that gives the writer the ability to write with lines that are sharper that other calligraphy pens. The Parallel Pen comes with both an ink cartridge and a bladder giving you the choice of whichever ink delivery system you prefer. Alternatively you can dip the pen or, if you want to try some color changes mid stream you can use a combination of dipping and cartridge ink. Touching the nib of one Parallel Pen to the nib of a differently colored Parallel Pen will achieve that same effect. The Parallel Pen is available in 4 different nib sizes – 1.5mm, 2.4mm, 3.8mm and 6.0mm. They are also supplied with a range of colored ink choices and these inks have been specially formulated for use with these types of nibs.