Rollerball with ink reservoirErgonomic triangular barrel for effortless, fatigue-free writing NEW: pleasantly smooth writingDRY SAFE: can be left uncapped for days without drying up (test ISO 554) Airplane-safe: automatic pressure equalisation prevents pen leakage while on board aircraftSturdy, durable metal tip Suitable for carbon copiesWater-based ink With clipPP barrel guarantees long service lifeAvailable in 10 brilliant colours and in our handy stand-up STAEDTLER boxLine width: approx. 0.3 mm