This ink cartridge maintains the quality of your writing instrument. For use with Sheaffer® fountain pens and calligraphy pens. Specially formulated to ensure long write out and a smooth flow. Pen Refill Type: Calligraphy Special Ink Type: N/A Refill For Series: Sheaffer® Calligraphy and Fountain Pens Tip Type: N/A.Unit of Measure : Each