Say goodbye to dull and frequent lead breakage with the engineered design of the uni-ball KuruToga Mechanical Pencil. This mechanical pencil features an exclusive rotating lead mechanism that resists lead breakage and maintains a continuous sharp point. Simply put--as you write, the pencil continuously rotates and sharpens the lead. Unlike regular mechanical pencils that produce thicker, lighter lines after a few uses, the KuruToga stays sharp, so it produces the same thin, dark line that you start out with, making your handwriting clearer and more precise. What's even better is that the KuruToga contains exclusive diamond-infused lead. It not only improves your writing experience, but also creates dark vivid lines.