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. This set includes four Parallel Pens and comes with one black and one red ink cartridge, a converter to clean the pen and a nib cleaner. This calligraphy pen is refillable. • Major breakthrough in calligraphy pen design! • The Parallel Pens come in four nib widths: 1.5 mm, 2.4 mm, .38 mm and 6.0 mm • Unique parallel plate structure achieves a more beautiful and sharper handwriting than existing calligraphy pens • Mixable colors-simply touch the nibs of two Parallel Pens together to create beautiful color graduations • Refillable with Parallel refill-single color (boxes of 6 ea.) or assorted box of 12 *Cap color indicates point size, not ink color