This Staedtler Lumocolor Whiteboard 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.The ink in these pens can be dry-wiped from whiteboards and surfaces such as glass and porcelain without leaving a trace.These pens have an improved colour intensity and are also fast drying and nearly odourless.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.