The break-resistant and exceptionally smooth leads for refilling the FC clutch pencils are deep black, blueprintable and can be easily erased.- TK 9071 leads for writing, drawing and sketching.- Suitable for TK 9400, TK 9500 and TK 4600 clutch pencils.- Lead diameter 2 mm.- Intense black lines.- Easily erasable.- 130 mm long.- Degree of hardness 6B.- Content: 10 leads of one degree of hardness per container.