Set of 4 artificial extra charcoals, diameter of 12 mm and length of 75 mm. 4 pieces of one hardness degree in a box. These charcoals are produced in four hardness degrees: 1, 2, 3, 4. These charcoals are used for larger surfaces. They are an equivalent replacement of natural charcoals. They are suitable for artistic and hobby drawing. It is recommended to use a fixative to stabilize the final artwork.