Pilot Parallel Calligraphy Pen Set, 1.5 mm, 2.4 mm, 3.8 mm and 6 mm with Black and Assorted Colors Ink Refills Unique parallel plate structure achieves a more beautiful and sharper handwriting than existing calligraphy pens. Mixable colors - using two Pilot Parallel Pens each with different color cartridges produce beautifully gradated lettering by touching the nibs together Each set comes with 4 Parallel pens: Available in 4 nib sizes: 1.5mm (Red Cap) 2.4mm (Orange Cap) 3.8mm (Green Cap) and 6.0mm (Blue Cap) Refills Parallel - 12 Colors Assorted Fountain Pen Cartridge Black refills- Pack of 6