The MONO graph with fixed 4 mm tip enables precise work and ensures less lead breakage. Ideal for drawing with ruler or template. Inside the corpus the lead is guided in a high-quality, three-part brass pliers. In contrast to the standard plastic pliers, the lead is held more stable and breaks less often. Equipped with an innovative "shaking mechanism": By shaking the pencil, the lead moves forward. Alternatively, the lead can be activated by pressing down the clip. By pushing up the clip, the lead is locked in place. With refillable eraser to unscrew. Refillable.