Distinctive grades for drawing,sketching, shading and drafting, Special impregnated lead for extra smoothness, Superior quality wood makes sharpening easy. The Range is available in Sizes:- B, F, H, Hb, 2B, 2H, 3B, 3H, 4B, 4H, 5B, 5H, 6B, 6H, 8B, 9B, 10B, 11B, 12B, Etc..!