The Orenz mechanical pencil features 0.2mm or 0.3mm lead for amazingly thin, clean lines. Moreover the Orenz is not a product for special use such as drawing, it is for general use. Its great for writing notes, math problems, graphs, and more Despite being so fine, the lead doesnt break as you write, due to the innovative Orenz mechanism. The guide pipe protects the entire length of the lead, and you write without extending the lead out of the guide pipe, which glides along the surface of the paper. Since the guide pipe has rounded edges, it doesnt catch on the paper or scratch it, you can write very smoothly. If the guide pipe becomes very shorter and you become difficult to write, just click the top button only one time. You need not click a few times as you would with other mechanical pencil. The guide pipe will extend again, along with the lead inside. Because theres no lead breakage, your papers remain without smudges from broken lead dust. Also, when you dont use, you can retract the guide pipe so it doesnt poke you or your belongings.