MONO graph with 4-mm metal nib enables precise drawing and less lead breakage. Perfect for drawing with ruler or templates. With innovative "Shake"-mechanism: By shaking the pencil, the lead is advanced. Or the lead can be activated by pressing down the clip. Pushing the clip upward fixes the lead. With rotatable, refillable eraser. Eraser refill: ER-MG. Available in four colours. Line width: 0,5 mm. Refillable.