Triplus Fineliner Pen with 0.3mm tip features a dry-safe formula that lets you leave the cap off for days without the ink drying up for long-lasting, cost-efficient use. Its ergonomic barrel provides a comfortable grip for relaxed, fatigue-free writing all day long. Water-based ink washes out of many different textiles to help you quickly clean up accidental marks. Airplane-safe design uses automatic pressure equalization to prevent your pen from leaking when you're on a flight.