Box of 100 Schneider ink cartridges with royal blue, erasable ink for a fountain pen. These ink cartridges have an international standard size with a ball closure, making them compatible with many other brands of fountain pens, but not, for example, with Parker.

The international standard ink cartridges are used by ACME, Bexley, Conway Stewart, Delta, Diplomat, Ducati, Faber-Castell, Ferrari da Varese, Graf von Faber-Castell, Jean Pierre Lépine, Marlen, Montblanc, Omas, Pelikan, Schneider, Signum, Stipula, Visconti, and Waldmann.

The international standard ink cartridges are not suitable for fountain pens from brands such as Aurora, Cross, Lamy, Parker, Pilot, Sheaffer, and Waterman (except for Waterman Audace, Ici et La, and Lady).