Pentel Super Hi-Polymer Lead Refills, 0.5 mm, HB, Black, 12/Tube - Pentel Super Hi-Polymer Leads are refills for .5 mm automatic pencils. A patented manufacturing process increases the strength of the lead, creating a smooth, bold line, less smearing and less breakage. Lead works with most refillable mechanical pencils and is guaranteed to scan on standardized tests. - 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.