Convert your Tornado Fountain Pen into a Capped Rollerball with this Converter Kit. This is for use only within Tornado Fountain Pens. This new feed/housing assembly is a rollerball tip specially designed to use bottled ink. This unit comes with a converter, or you can use any standard international cartridges (not included). Fill the converter with your desired ink or chose your cartridge and snap it into the unit, reconnect it to the Tornado pen barrel, and let the writing begin. A whole new spectrum of ink colors can now be used with this Rollerball Converter Kit to make your Tornado Fountain into a capped rollerball. *Not recommended to use with shimmer or glitter inks. ... Read more