A special drawing black lead measuring 5.6 mm in diameter. Three hardness levels are available for production: 1, 2, 3. It is distinguished by a strong black velvet mark. It is frequently used for other kinds of drawing in addition to portraying. Artists seem to like it. 5.6mm Lead Refills for Drawing. accessible in three distinct grade levels. The length of the clutch pencils is 120mm. produced in the Czech Republic.