The triplus Fineliner feels comfortable in the hand, making writing and drawing effortless. The pen can remain uncapped for days without drying out, and the PP barrel ensures a long lifespan. It is washable from most fabrics. It features a super fine, metal-clad tip. The ergonomic, triangular barrel allows for relaxed writing. The cap has a clip. The ink is water-based. An airplane-safe automatic pressure equalization prevents the pen from leaking during flights.