Pilot Dr Grip Retractable Ballpoint Pen Refills, 1.0mm, Medium Point, Black Ink, 6 (Pack of 2) Offers a patented, advanced liquid ink technology for consistent application. Delivers smooth, clean results you can depend on Trust Pilot for premium quality performance. Fit Dr. Grip Ballpoint Pens (36100 and 36101) Do NOT fit Pilot Dr. Grip Center of Gravity Gel Pens and Dr. Grip Rollerball Pens (36270~36273, 36180, 36181)