Fountain Pen Refill Cartridges, permanent Blue Ink, 4 Packs of 5/Pack 20 total PAR30160 Ink Cartridge Refills for Parker Pens, permanentInk. Cartridge keeps ink contained so replacing it is a clean process Parker refill cartridges are fitted with ink reserves ready to be released with a tap when a writer starts running on empty Suitable for use with all Parker fountain pens. Parker Quink inks are specially designed and formulated to the most exacting standards to ensure that Parker products deliver faultless performance.