High-quality HB-grade lead is strong and durable. With every stroke, it produces consistent marks and reliable results across a wide range of media. These dependable refills are highly recommended for Tri-Grip, Aspire, Clickster? and additional Paper Mate? pencils (sold separately). Lead Degree (Hardness): HB; Lead Color: Black; Refill(s) For: For Most Refillable Mechanical Pencils; Lead Diameter: 0.5 mm.