Strength & Deep & Smooth -Uni-ball Extra Fine Diamond Infused Pencil Leads, 0.4 Mm-hb-[nano Dia]30 Leads X 3 Pack/total 90 Leads/(with Values Japan Original Description of Goods) Uni develops the lead of the top quality Intensity of the lead was sharply strengthened by blending the particles of a diamond. Since particles have aligned by high density, it can write distinctly still more deeply And it can draw more smoothly. CM-140