DyeStuff Ink Cartridge 1.2cc/2 Cartridge per unit - Blue

Platinum ink cartridges are made specifically for use in Fountain Pen Lovers.A stainless steel ball holds the ink from coming out until the cartridge is pushed into the back of the gripping section of your fountain pen. This serves a second purpose which helps meter the ink flow when the cartridge is opened and allows for priming when the pen is shaken.