Uni Nano Dia Color Mechanical Pencil Lead 0.5 mm

Uni NanoDia color mechanical pencil leads are erasable and contain nano-diamond particles. These particles strengthen the lead and allow for less breakage. The nano-diamonds make the lead smooth writing and vibrantly colored. NanoDia can be erased with a standard pencil eraser, too! Each refill includes 20 pieces of .5mm lead.