Uni-ball - LEAD REFILLS Range - ref: ULSS0712 HB - Case of 12 HB 0.7 mm leads - Black

Uni NanoDia leads are extremely strong! Thanks to the inclusion of millions of nano-diamonds, they offer exceptional resistance while maintaining great writing smoothness. Their features are also darker and smoother. - Available in 2 diameters and 3 gradations - Ultra-resistant mines: 22% more than traditional mines - Resists pressure - Long life expectancy - Exceptional plot density