Superior quality Graphite Pencils with perfectly coordinated degrees of hardness. For use in Design work, technical drawings, sketching and illustrations. The Ø 2.2 mm to Ø 3.5 mm (depending on the hardness) graphite core is made of the finest high-quality raw materials so that it transfers very well. Why we love these: They're incredibly smooth to write or draw with. The slightly not-round body means the pencils don't roll around on your worksurface.