Innovative Super-Flow-System guarantees consistent ink flow from start to finish Line width approximately 0.5 mm in Black ink. Waterproof according to ink standard ISO 14145-2 Hybrid conical tip, high-quality metal clip and rubberized surface to promote relaxed writing without hand fatigue Large ink reservoir and level indicator to ensure every drop of ink is used. Cap-off ink does not dry up, even if the cap is removed for 2-3 days Produced CO2 Neutral. Made in Germany