Pilot BRFN-30F-B Acro Ballpoint Pen Refill for Cavalier, Acro Drive, Fine Point, Black Refill for High End Multi-Color Acro Ink (Oil base ink) Ballpoint Pen, AcroDrive from Japanese stationary brand Pilot Oil based Acro Ink Refill Pilot Acro Ballpoint Pen Refill for Cavalier, Acro Drive, Fine Point, Black