Charcoal: Charcoal pencils are probably the oldest writing instrument known by humanity and have been used since prehistoric times. Our charcoal is primarily fired and finely ground charcoal by burning willow and grapes branches in place with a trace of plant oil-free viscosizers. The unglazed black tone and charcoal can easily reach the base of the paper, which is deeply associated with careful material selection and time taking the carbonation of the material you do before the fine powder. Lead Diameter: 5mm Pencil Diameter: 8.5mm Cross Section: Round Wood Shaft: Natural Cedar Finish : Black Lacquer Gloss Print: Silver Dipping: Matte Black Dome: Matte Black