Rod for the mech pencil 0.5 mm NANO HB

0.5 mm HB. Exclusive UNI rods with nano-particles. Each rod contains 400 million ultra low carbon particles "nano-diamonds". This ensures that the rods are high strength, they do not crumble and do not break even under heavy pressure when writing! The combination of carbon particles and nano-diamond particles with silicone oil, which has a high degree of viscosity, provides brightness, clarity line of writing and feeling smooth, soft sliding of the rod across the paper. In tube 12 rods.