Parker Quink Ink Refill Cartridges for Rollerball Pens, Medium Point, Black,(3221531) (2-Pack of 2) Cartridges keep ink contained so replacing it is a clean process, and are fitted with ink reserves ready to be released with a tap when pen is low. Washable ink lays down smoothly, dries fast and won't smear. Suitable for use with all Parker rollerball pens. Parker Quink inks are specially designed and formulated to the most exacting standards to ensure that Parker products deliver faultless performance.