Monteverde USA® piston ink converters to fit Monteverde USA® and most fountain pens. Monteverde USA® premium quality ink converters are the finest available today. The use of ink converters allows the user to choose bottled fountain pen ink as an alternative to disposable ink cartridges, thus eliminating waste and opening up the vast world of nearly unlimited bottled ink colors. Although this converter will work with any fountain pen ink, Monteverde USA® always recommends our ITF™ range of inks. ITF™ inks improve ink-flow quality, extend cap-off time and lubricate and protect ink feeding system from corrosion and clogging.