Longstanding Mitsubishi Pencil Co's Nano Dia 0.5mm mechanical pencil lead refills come in three different hardnesses for your preferred writing style. The high quality leads are specially blended for a smooth, distinct writing experience, and come in a smart looking hard case. 40 pieces each, 60mm long.
HB: A standard, balanced lead.
B: One grade softer, this lead writes smoother, softer, and darker
2B: A further grade softer, this lead writes smoothest, softest, and darkest of the three