This Staedtler Lumocolor Permanent Marker has a bullet tip that can produce a drawing line between 2mm and 5mm.These pens are dry safe which means they can be left uncapped for days without drying up.Lumocolor pens have excellent smudge proof and waterproof qualities on almost all surfaces due to the fact that the ink dries in seconds. This also makes them very useful for left handed users.These permanent markers have lightfast and are colour intensive with a low odour and xylene free.This is a pen that is not affected by changes in air pressure, thanks to \"Airplane-Safe Technology\'. In-flight leaks are caused by expanding air inside the ink chamber.