Triplus Fineliner Pen with 0.3mm tip features an ergonomic barrel that provides a comfortable grip for relaxed, fatigue-free writing all day long. Airplane-safe design uses automatic pressure equalization to prevent your pen from leaking when you're on a flight. Water-based ink washes out of many different textiles to help you quickly clean up accidental marks. Fineliner design with metal-clad tip creates precise, fine lines.