The standard Pearl Black Kaweco converter allows you to use bottled ink in regular-sized fountain pens via a plunger system. Produced with an international standard nib fitting and a rotary piston mechanism with pearlescent black finish details, it replaces disposable cartridges with greater economy and sustainability. It is compatible with Kaweco Perkeo, Student, Dia2, Special pens and models from other brands with a standard European fitting. Its transparent reservoir allows precise control of the available ink level, making it indispensable for bottled ink enthusiasts.