Castell 9000 pencils have superior leads made of finely ground graphite and clay. These smooth, pure graphite pencils are never scratchy and are great for drawing and sketching. The full length of the lead is glued to the wood casing of the pencil to strengthen the lead and prevent breakage, which allows for better sharpening and produces a fine point. The specialized sets contain pencils in degrees of accurately graded, exclusively formulated leads.
The 3-Pencil Art Set (FC800029) includes grades 2B, 4B and 6B. The 3-Pencil Art Set (FC119099) includes grades 4B, 6B and 8B. The 3-Pencil Design Set includes grades HB, 2B and 4B. The 6-Pencil Tin Set includes grades HB, B, 2B, 4B, 6B and 8B. The 12-Pencil Art Set includes grades 8B through 2H. The 12-Pencil Design Set includes grades 5B through 5H those particularly suited to meet the needs of a designer.