Pentel Super Hi-Polymer Lead Refills, 0.5mm, 2H, Black, 12 Leads/Tube Super Hi-Polymer lead refills resist breaking and are super strong. They provide smooth, uniform marking for your everyday writing and with reduced smearing. HB lead refills are guaranteed to scan on standardised tests. Lead Degree (Hardness): 2H; Lead Colour: Black; Refill(s) For: For Most Refillable Mechanical Pencils; Lead Diameter: 0.5 mm. Compatible with most refillable automatic pencils. Manufacturer's limited lifetime warranty.