Faber Castell 9000

With superior leads made of finely ground graphite and clay for smooth laydown, the Faber Castell 9000 is a professional grade graphite drawing pencil.
The pencil is available in 16 degrees of hardness: 8B, 7B, 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, and 6H. It is also available in jumbo with five degrees of lead hardness: HB, 2B, 4B, 6B, and 8B.
B = Blackness F = Fine HB = A combination of H and B H = Hard