The break-resistant and exceptionally smooth leads for refilling the FC clutch pencils are deep black, blueprintable and can be easily erased. Available in 14 grades of hardness. The grades 6H to 3B have a lead diameter of 2 mm, 4B to 6B have a lead diameter of 3.15 mm.
TK 9071 leads for writing, drawing an sketching
to fit for TK 9400, TK 9500 an TK 4600 clutch pencils