Each writing system is engineered for different writing speeds and applications. Roller: roller delivers consistent, free-flowing writing. It has the feeling of a fountain pen, without the mess. Key feature: These elements show an attention to detail that comes through in the quality of your writing experience. 3 Way Protection Against Water, Fading and Fraud – Pigment-based uni Super Ink contains particles that form an indelible bond in paper. Won’t Leak in Flight – Jet setters get it-these pens are designed to compensate for changes in cabin pressure. Comfort Grip – Ergonomic designs and unique grips keep hands free of pressure. Fade- and Water-resistant, Acid-free Ink – Perfect for archival uses, these help words remain bold over time. Quick-drying Ink – Great for fast writers and innovative lefties.