The Schneider One Business Rollerball Pen features an innovative Super-Flow-System that guarantees consistent ink flow from start to finish. The Ultra-Smooth tip, large ink reservoir with level indicator make sure every drop of ink is used. Waterproof ink according to ISO 14145-2. Includes a high-quality metal clip and an ergonomically rubberized grip to promote a relaxed writing experience without hand fatigue. The Rollerball will not dry out, even if the cap is left off for 2-3 days. Approximate line width is 0.6 MM, four-pack includes one Rollerball each of Black, Red, Blue and Green inks. The Schneider One Business Rollerball Pen is produced Carbon Neutral and made in Germany.