This mechanical pencil combines writing and erasing in one product. The telescopic eraser was specially developed for erasing the lead of mechanical pencils. In addition, MONO graph is equipped with a special mechanism to extend the lead, achieved through lightly shaking the pen. In this way, the usual change of grip for using a push-button type is not ne-cessary. By pushing a clip upwards, the lead is fixed so that it does not come out accidentally.