Uni-Ball® Vision 0.8 MM Black Bold Liquid Ink Rollerball Pen Feature Uni-Flow Ink That Creates A Steady Flow Of Water-Resistant Ink. Blaze Through Important Projects On The Go With These Versatile Vision Elite Pens. Developed With Business Travelers In Mind, The Pens Resist Leakage Even Through Changes In Cabin Pressure, So You Can Keep On Working Without Skipping A Beat.