A breakthrough in calligraphy pen design, this pen features a nib that consists of two parallel plates, allowing the writer to produce lines sharper than existing calligraphy pens. Ink cartridges can be switched in the pen to create gradated color lines and mixed colors. Each set comes with a Parallel Pen, one black and one red ink cartridge, a converter to clean the pen and a nib cleaner. This calligraphy pen is refillable. Additional Parallel Pen ink cartridges are sold separately. Nib width is 3.8MM.