Pentel Super Hi-Polymer Lead Refills, 0.9 mm, HB, Black, 15/Tube - Super Hi-Polymer Leads are designed for automatic pencils. Made with a patented manufacturing process that provides greater lead strength, a darker line and minimal breakage. 60mm length. HB lead is guaranteed to scan for tests. Smooth, uniform marking with reduced smearing. Compatible with most refillable automatic pencils. Won't damage paper. Reduced breakage. Effortless writing.