This set offers the finest quality of both compressed charcoal (produces a jet black mark) and natural charcoal (produces a blue-black mark). Both types of charcoal can be easily blended into paper or removed with the included kneaded eraser to produce highlights.Details: Black10 piecesGrease and oil-freeMade with natural materials Contents: 1 compressed charcoal pencil1 natural charcoal pencil3 compressed charcoal sticks (extra soft, soft and medium)4 natural charcoal sticks (3-6mm) Gray kneaded eraser