Smoother and stronger than the competition. Proprietary lead formula resists breaking. Dark imprint is ideal for drawing, while light imprint is ideal for drafting and template work. HB lead is equivalent to a #2 pencil and is guaranteed to accurately scan on tests and documents. Lead Degree (Hardness): HB; Lead Color: Black; Refill(s) For: For Most Refillable Mechanical Pencils; Lead Diameter: 0.5 mm.