STAEDTLER triplus roller has an ergonomic triangular barrel for effortless, fatigue-free writing. The unique DRY SAFE feature of the water-based inks enables pens to be left uncapped for days at a time without drying up. Line width approx. 0.3 mm. The stand-up STAEDTLER box transforms into a pen stand. Comes in a set of 10 brilliant colors.