Extremely smooth writing from this pen, offering crisp edges and sharp hairlines. Nib point consists of two parallel metal plates and allows for lettering in two sizes. Use the .5mm edge for sharp, monoline writing or use the broad edge for calligraphic writing. You can also produce color-blended letters by touching ink from one pen to a second pen loaded with another color. Available in four sizes, includes one red and one black cartridge and a bladder/converter.