Refill your fountain pen with the Scriveiner Fountain Pen Ink Cartridges. These cartridges fit most fountain pens that accept standard-sized ink cartridges, and they produce a smooth ink that flows effortlessly onto the page. Permanent ink flows smoothly out of the cartridge. Designed for use with Scriveiner fountain pens. Fits most fountain pens that accept standard-sized ink cartridges. Black ink produces a bold look.