JetPens.com proudly presents the Uni Kuru Toga Auto Lead Rotation Mechanical Pencil with Rubber Grip - 0.5 mm - Black Body. It may take a true pencil expert to understand the common pencils problem but hang in there as we try to explain. When using standard mechanical pencils， the lead wears down on one side， forming a slanted surface. Each time you write you end up using a different lead surface (pointy， flat， wide， thin， etc.) depending on how you hold the pencil. This can cause multiple annoyances: You might start with a sharp point， but as you continue to write the point is worn down and thus your line widths are not uniform. This can also lead to smudgy and thick lines. If you happen to start writing with the tip of the angled point， it is likely to scratch or catch on the paper. The various angles at which the lead comes into contact with the paper commonly cause lead breakage.The Kuru Toga， on the other hand， has a core rotation mechanism that continually rotates the pencil lead as you write. A spring-loaded clutch twists the lead incrementally every time you lift the pencil from the paper. This allows a uniform wearing of the lead so that it always remains pointed. This not only solves the problems above， but also gives you an amazingly thin line. In effect， you use only 50% of the lead area that you were previously using with your old mechanical pencil. Thus， a 0.3 mm Kuru Toga writes incredibly thin lines and have less breakage than a standard 0.3 mm mechanical pencil. In addition， the rubber grip is easy on the hands and lets you write comfortably for long periods of time. This is great for students! Dimensions: 5.7 inches length， 0.4 inches diameter (14.5 cm length， 1.0 cm diameter).