Box of 6 rectangular Milan natural graphite bars 4x15x150mm Natural charcoal made from alder wood burned at high temperatures. Their canes are boiled prior to the preheating and burning process in ovens at high temperatures. The resulting charcoal is an irregular grayish-black stick that produces a dark gray line. Rectangular shape size: 4x15x150 mm. Contains 6 units. Publisher: Milan.