Who says diamonds are only for jewelry? They are exquisite for creating precious artwork as well. The Uni NanoDia Low-Wear Pencil Leads are infused with nano-diamond pieces to create an unusually strong and high-quality lead. Multiple lead grades are available.
The UNI "H" .3mm lead is equivalent to Pentel's "HB" lead. If you're going to
use different lead grades, then stick to one brand, otherwise you'll end up
wasting money on something you didn't expect like I did.