This is one 0.5 mm ballpoint ink refill component for the Uni Style Fit writing system, featuring smooth Uni-ball Jetstream ballpoint ink.

Uni-ball has created a new writing system that is both extremely customizable and affordable. Like the higher end Sharbo X from Zebra, the Style Fit writing system gives you the freedom of choice to create a writing instrument that is as unique as you are. You can customize many aspects of your pen including what type of refills you want (gel, ballpoint, or mechanical pencil), the pen body and ink colors that you want, as well as the number of writing instruments you want to have (different sized bodies are available that can hold 1, 3, or 5 writing instruments).