The Pentel ORENZ Anti-breaking Lead Mechanical Pencil features a unique one-click anti-breaking system which effectively protects lead from breaking. Unlike conventional mechanical pencil writing with the lead exposed from the tip, the Orenz pencil magically writes with the lead hiding with in the tip pipe. To correctly use the pencil, first click the end cap to extend the lead out from the tip pipe. Press the cap down while gently touch the lead to the surface of the paper until the lead is becomes invisible. Then you can start writing. Sounds wired? But that is how it works. If you really want to know how it works, try one yourself? Because it is anti-breaking, the pencil is available in various lead sizes particularly ultra-fine leads i.e. 0.2mm 0.3mm etc, which is ideal for fine writing and drawing.