Super Hi-Polymer Leads are designed for automatic pencils. Patented manufacturing process provides greater lead strength, a darker line and minimal breakage. 60mm length.Editorial ReviewGuaranteed to scan for tests.Smooth, uniform marking with reduced smearing.Compatible with most refillable automatic pencils.Won"t damage paper.Reduced breakage.Effortless writing.Made with Super Hi-Polymer® 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): B; Lead Color: Black; Refill(s) For: Most refillable automatic pencils.; Lead Diameter: 0.7 mm.