Parker QuinkFlow Ink Refill for Ballpoint Pens, Medium Point, Black (3031631PP) The smoothest, cleanest, and most consistent Parker ball pen refill ever. Fits all Parker ballpoint pens and any pen taking the Parker-style ballpoint refill. Ballpoint pens are convenient for daily use. Parker's Quinkflow technology provides smoother, cleaner, more consistent writing performance. Parker Quink inks are specially designed and formulated to the most exacting standards to ensure that Parker products deliver faultless performance. Limited warranty guarantees product for 2 years from date of original purchase against defects in materials or workmanship.