Uni-ball Jetstream Fine Point Roller Ball Pens Refills for Standard Pen Type -0.5mm-black Ink-value Set of 10 (With Our Shop Original Product Description) Refill for New Jetstream Gel pen 0.5mm (Keep in mind that it does not fit Multi Type Jet Stream) Quick-drying ink helps prevent smearing - perfect for left-handed writers Features uni Super Ink- specially-formulated to become trapped in paper, helping prevent criminal check washing and other document alteration