A very high quality compressed charcoal available in 3 grades of hardness. A higher grade of blackness compared to natural charcoal is achieved through better adhesion to the paper. Compressed Charcoal - duroplastic case, 6 leads, length: 120 mm, diam. 5.6 mm (length: 4.72 inch, diam. 0.22 inch), 3 diff. leads available.lead: 1 soft | 2 medium | 3 hard