Its FOR ALL graphite lead 2B marks on almost all surfaces, no matter if dry or wet, glossy or rough, dusty or oilyWipe clean from glossy surfaces with a damp cothBarrel with roll-stopMost versatile capabilities due to special color leads: for bright or dark surfaces, in water soluble or water resistantConvenient quiver cap with special clip for perfect one handed handlingPatented: The integrated sharpener in the quiver cap – always and immediately at handHigh value push mechanism for automatic lead feed in a stainless steel tubeLeads most easy to refill from the back endExtremely long lasting and sustainable due to high quality product technique and refill abilityImproved dust and moisture protection