Pelikan 4001 gtp/5 ink cartridges for fountain pens, Brilliant Black, 1. 4Ml, contain an ink formula developed over 125 years ago to protect both fountain pen and nib. The bold color ink produces clear line definition with an even flow. These cartridges are for Pelikan fountain pens and many other brands. 1. 4Ml of ink in each cartridge. Made in Germany. Pack of 10.