Uni-Ball® Jetstream 1.0 MM Black Medium 101 Rollerball Pen Offer Excellent Writing Quality With Quick-Drying Ink That Prevents Smudging. The Ink Is Specially Formulated In A Way That Helps Trap It In Paper, Preventing Document Altering And Check Washing. Archival-Quality And Acid-Free Ink For Documenting And Record-Keeping. Softly Textured Uni-Ball Pens Have A Secure Grip For Control.