These slim, triangular-barrel pens are ergonomically designed for comfortable drawing and writing. Super fine 0.3 mm porous points are protected from damage by a metal-clad tip. Staedtler's acid-free, non-permanent, "dry safe" ink won't dry out even if the pen is left uncapped for several days. The innovatively designed case forms a stand-up display and keeps pens organized. Set of 10 - Colors included are Yellow, Magenta, Red, Orange, Light Green, Green, Light Blue, Blue, Brown, and Black.