Sturdy, well-balanced pen. This capped pen is designed for extended periods of use. The exclusive ComfortZone®, latex-free grip is designed to reduce writing fatigue. The transparent barrel allows you to see the ink supply. Durable tip delivers a consistent line without skipping. The 0.7mm tip (BK90) writes fine lines; 1.0mm (BK91) writes medium lines. The long barrel holds more ink than the competition and can write for almost a mile!