Monteverde Pens: M3 Mega Ink-Ball... Monteverde presents an entirely new approach to a 3-function luxury writing instrument. The MEGA M3 is one single pen that can function as a ballpoint pen at one end with an interchangeable Ink-ball tip/fountain pen nib at the other. The Ink-ball tip is easily substituted with a German fountain pen nib fitted with an Iridium tip. Also included are 12 ink cartridges, 6 super mini ballpoint refills and an extra Ink-ball front section.