Waterman S0112881 Convertor for Fountain Pens (56010W) Simple plunger-driven ink container refills easily to use liquid ink neatly and conveniently with your fountain pen Liquid ink is smooth-flowing, leaves a solid, confident line, and adds to the sophisticated experience of fountain pen use This converter fits all WATERMAN fountain pens sold in the U.S Using a refillable converter rather than disposable ink cartridges saves money and reduces waste