Pentel® Super Hi-Polymer Lead Refills, 0.5mm, 2B, Black, 12 Leads per Tube Made with Super Hi-Polymer® lead, these refills are among the strongest available. They provide smooth, uniform marking for your everyday writing without damaging your paper and with their reduced smearing you`ll always be able to go back on your notes. Compatible with most refillable automatic pencils. Global Product Type: Pencil Leads; Lead Diameter: 0.5 mm; Lead Degree (Hardness): 2B (Soft); Lead Color: Black.