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). Pencil Lead Format: Tube; Lead Diameter: 0.5 mm; Lead Degree (Hardness): HB; Lead Color: Black.