The Pilot Parallel is a major breakthrough in calligraphy pen design.The "Parallel" nib consists of two parallel plates, allowing the writer to create much sharper lines than with other calligraphy pens. It can also create gradated colors by transferring ink from one pen nib to another, allowing two different ink colors to then be used from one pen nib. The set of 4 pens includes 1 each of the 1.5 mm, 2.4 mm, 3.8 mm and 6.0 mm nib sizes. Each pen box contains a Parallel Pen, 2 ink cartridges, converter for cleaning pen unit, nib cleaner, instructions and care guide. Made in Japan.