A 2-pack of Monteverde capless gel P42 rollerball refills in blue/black with a 0.7mm fine tip. A combination of gel ink with a ceramic ball and a stainless steel tip. These ceramic gel refills are compatible with many Parker-style capless (twist-style) ballpoint and rollerball pens. Additionally, it also fits the following brands of twist-style ballpoints and rollerballs: Aldo Domani Acme Aurora Bexley Bossert & Erhard Colibri Conklin Delta Diplomat Elysee Faber-Castell Foray Focus Hauser Inoxcrom Itoya Jean Pierre Lepine Krone Marlen Montegrappa Monteverde USA Nettuno Omas Parker Pelikan Retro 51 Rotring Schmidt Schneider Stipula Visconti Yafa and many more