The Pelikan 4001 Blue Pen Refill (6 Pack) is the classic standard ink cartridge for feeding school and office fountain pens. The box includes 6 small Pelikan 4001 ink cartridges in royal blue, formulated with high-purity ingredients that protect the pen feeder and allow for erasing marks with correction fluid. The blue tone offers excellent legibility in school notebooks. It is the essential refill for students of all ages and everyday writing.