Monteverde Capless Ceramic Rollerball to fit Pelikan Rollerball Pens - Black Standard size Pelikan roller ball refill by Monteverde Convert your ballpoint pen into a Capless Rollerball High quality metal parts with Stainless steel tip with ceramic ball Length: 4.36 inch (110.8mm) Nib Size: Broad (1.0mm) Refill Reads: Monteverde USA Ceramic Roller - Medium K23