The lead that is a 'Triple Threat": #1 selling lead in the U.S.A., the industry "standard", and stronger than the competition. 0.5 mm lead creates fine, crisp lines. Proprietary lead formula resists breaking. Pentel Super Hi-Polymer HB lead is equivalent to a #2 pencil, guaranteed to scan and break resistant. Part of the Pentel Recycology Line all HB lead tubes are composed of 100% plastic.