The Parker blue pen refill pack 1950384 C/5 ensures a long-lasting, high-quality supply for your Parker fountain pens. This pack of 5 Quink blue ink cartridges contains an advanced formula ink with high pigmentation, designed to flow steadily without clogging the nib. The classic blue shade offers a clear, professional read on any type of paper. It's the essential refill for students, teachers, and professionals who use fountain pens daily.