We have had a huge response to our coloured mechanical leads for our 0.7mm pencils and now we have sourced some 0.5mm coloured leads! 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. You can erase cleanly and easily with a regular eraser. Compatible with your .5mm mechanical pencils.