Pilot Parallel 4-Nib Calligraphy Pen Set, Includes Ink Cartridges (90078) Set contains 4 individual Parallel pens, one each with 1.5mm nib, 2.4mm nib, 3.8mm nib and 6.0mm nib Each pen comes with two cartridges (black and red) Two different ink colors can flow from the same nib for a beautiful graduated effect Unique "Parallel Plate" Nib Technology allows you to produce clearer sharper writing than with any other pen Refillable - Pilot calligraphy refill model #77313 and additional colors sold separately