Super Hi-Polymer refill leads, 0.7mm, extra strong Grade HB. The Pentel Super Hi-Polymer Leads are from the high-performance family and are Stronger and darker than regular leads. They have a slower wear rate than usual leads. These leads are suitable for all makes of Pentel mechanical pencil. They are Ideal for writing and drawing on Paper, tracing paper and card. Each tube is made from 100% recycled material and contains 12 leads.