For every mechanical lover, breaking off pencil leads during writing or drawing is very annoying. Uni NanoDia Pencil Lead uses new nanometer technology to create stronger and high-quality lead. It helps users to effectively avoid breaking off leads during writing or drawing.
It becomes popular which also because its colorful and stylish case.
Its counterpart in Pentel is Pentel Ain Stein Lead, which is also famous for low-wear lead.