Permanent ink lays down smoothly dries fast and won"t smear. 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. Pen Refill Type: Fountain Special Ink Type: N/A Refill For Series: All Parker® Permanent Ink Fountain Pens Tip Type: N/A.Unit of Measure : Pack