Quil 9550 Black Extra-Fine Rollerball Refills - 2/pk aka Duratone 95 Compatible Quill 9550 black XF two pack....NOT Quill OEM as it is no longer being made EXACT REFILL is 95fit most capped rollerball pens; aka Duratone 95; same as Schmidt OEM 5285 black XF50-5285XF....Quill Style 9550 length = 11.1 cm; will NOT fit a ballpoint pen bulk packaging