Staedtler 0.9mm hb lead mars micro poly carbon , easy to use & reliable, automatic pencil leads, these quality staedtler leads are made of an extra-strong formula. Are ideal for sketching, writing, drawing, and many other applications. In keeping with their reputation for precision, staedtler leads has labeled the 0.9 mm hb lead, mines fines, minas fines, 1 pieces tube.