Pack of 12 Conklin ink cartridges to fit all fountain pens that take standard international sizes. Enjoy peak performance with ITF which drastically improves ink-flow quality, extends cap-off time, and lubricates and protects the ink feeding systems from corrosion and clogging. Our inks are available in a variety of vibrant colors. Made in Europe, packaged in USA, Distributed by Lanier Pens. Each set of cartridges are standard international size and are individually packaged in a thin, hangable and reusable plastic container. Perfect for any fountain pen lovers, you need your favorite Conklin ink always within reach. Each cartridge is made with European ink treatment formula (ITF).