Black Monteverde Capless Gel to fit Montblanc Ballpoint Pens Standard size Montblanc ballpoint refill by Monteverde Convert your ballpoint pen into a Capless Rollerball High quality metal parts with Stainless steel tip and Fine Point & Gel Ink Length: 3.90 inch (99.3mm) Nib Size: Fine (0.6mm) Refill Reads: Monteverde USA Capless Gel - M42