Nano Dia Pencils, 2 Dozen B and 2B, 12 pencils each, total 24 pencils 2 sets of pencils Mitsubishi, Mitsubishi Pencil, uni New, Unused The box has some damage, such as marks from sticker removal. The core is made by blending nano-diamonds with carefully selected graphite and clay, and incorporating special oil. It allows for dark, clear, and smooth writing even with light pressure.