Nitram produces its charcoal using a unique process that maintains the wood’s cell structure which increases the charcoal's durability and helps prevent breakage. Nitram charcoal doesn't break like willow or vine do, and feels much less brittle. Because of its solid strength, the charcoal can be sharpened to a fine point with the Nitram Sharpening Bloc. Also you produce less dust when working expressively. The charcoal allows for deep dark shades while still being easily erased for luminous light effects. The Petits Bâtons are extra soft rounds, particularly good for figure drawing. Box contains 5 round charcoal sticks. Each stick is approximately 152mm long and 6mm wide.