Made with Super Hi-Polymerï¿½ lead, these refills are among the strongest available. They provide smooth, uniform marking for your everyday writing and with their reduced smearing you'll always be able to go back on your notes. Guaranteed to scan for tests. Lead Degree (Hardness): H; Lead Color: Black; Refill(s) For: Most refillable automatic pencils.; Lead Diameter: 0.5 mm.