Our 4001 inks are part of a number of our products that have proven themselves over many decades. Thanks to the formula which has been perfected down to the finest detail, the proven quality of the 4001 ink is consistently assured. They guarantee an even flow of ink, powerful written expression and vibrant color. A true jack of all trades. Ink 4001® for all Pelikan piston fountain pens and many other models; Can be used in cartridge fountain pens with a converter; Made in Germany.