Sharpen differently! The sharpener Ell M1 from KUM has an unusual shape. The elongated ellipse is flexible and unbreakable and also dirt-proof thanks to the lid. The sharpener, which is suitable for pens with a diameter of up to 8 mm, is located in the middle part. The sharpener is made of magnesium. In order to achieve a perfect sharpening result, extreme and very precise tolerances must be observed. Magnesium is the ideal material for making a sharpener with the highest precision. KUM is the only manufacturer in the world to equip its sharpeners with curved knives. This has the advantage that the knife edges are under constant tension and are not lifted by the pressure when sharpening, which means that tearing of the pen tip can be ruled out.