This collection introduces the new concept of "Parallel Plate Structure".The nib point, which consists of two parallel plates, can achieve more beautifull and sharper lines than existing calligraphy pens. It can also produce attractive, gradated colours by transfering ink from one pen nib to another pen nib.
Two different ink colors can then be used from one pen nib to achieve this effect. This is why the Pilot Parallel Pen is a major breaktrough in calligraphy pen design.