Pilot Dr. Grip Center of Gravity Ballpoint Ink Refill, 2-Pack, Medium Point, Black Ink (77271) Refill fits the following pens: Dr. Grip Center of Gravity, Dr. Grip PureWhite and FullBlack, Ageless Ball Point, MR Ball Point and Axiom Premium Ball Point pens 2 ballpoint pen ink refills per pack Black ink Turbo charged ink with a medium point Extend the life of your favorite Pilot pen