Fits the following rollerball pens:
ACME®Aldo Domani®Aurora® Bexley® Bossert Erhard® Colibri® Delta® Diplomat® Elysee® Faber-Castell® Inoxcrom® Jean Pierre Lepine® Krone® Marlen® Montegrappa® Monteverde® Nettuno® Omas® Pelikan® Retro 51® Rotring® Sensa® Stipula® Visconti® Yafa®