Common mechanical pencils come in sizes to accommodate 0.5 ... Thanks to [iliis] for sending in this tip.

An uncommon feature of mechanical pencils is the Kerry’s cap, which resembles those found on fountain pens and lets users carry and preserve the tip without damaging the pencil or their pockets ...

This keeps the tip of the writing surface smooth and strong. The plastic pencil is available in a number of different colours, with a transparent case revealing the mechanism within. Mechanical ...