The Nite Ize Inka Pressurized Refill Cartridge is a pressurized, waterproof blue ink refill cartridge is compatible with Inka pens and gives them their unique ability to write upside down and in extreme conditions and altitudes.
Features:
- Compatible with all Inka pens
- Waterproof blue Ink
- Pressurized cartridge writes upside down and in extreme conditions