First developed in 1905, the Castell 9000 graphite pencil range from Faber-Castell is a true classic & a staple found in the collections of artists, illustrators, writers & various professionals across the world. Available in 16 finely graduated degrees of hardness from 8B - 6H, the range of hues (from a delicate grey to a deep black) makes them ideal for all technical & artistic applications. Fully bonded with the wooden barrel & coated in a strong, water-based varnish, they're practically break-resistant for a longevity almost unheard of amongst art materials of their quality. 8B - 3B Extra soft, deep black for artistic ink-like impressions of depth. 2B - F Soft, lighter black tones, ideal for both drawing & writing. H - 6H Harder, ranging to light grey for technical drawings, such as architectural work.