The Faber-Castell TK Leads 9071 3.15 5B are designed to be break-resistant and provide an extremely smooth writing experience when refilling FC clutch pencils. These leads are deep black and blueprintable, and can be effortlessly erased. With 14 different grades of hardness available, ranging from 6H to 6B, the lead diameter for grades 6H to 3B is 2 mm, while 4B to 6B have a lead diameter of 3.15 mm.
