UNI Jetstream SXN217 Retractable Rollerball Pen 0.7mm, Assorted Colours - 4 Pack. These Uni Jetstream Retractable Rollerball Pens contain a super smooth, rollerball nib which allows you to write with ease. They come filled with Uni Super Ink which is permanent, waterproof and fade-proof so your writing will be long lasting. These pens feature a 0.7 mm nib which produces a fine line. The quick-drying ink makes these pens perfect for everyday use. Each pen has a rubberised barrel that makes in comfortable to hold and write with. The nibs are retractable so you can keep them protected when not in use. This pack contains 4 pens in assorted colours.