Pentel Super Hi-Polymer HB lead resists breaking and never needs sharpening. Ultra-thick lead easily writes smoother bolder, darker lines. Refill lead for 1.3mm mechanical pencils. Each tube of Pentel Super Hi-Polymer lead is made of 100% recycled plastic and part of the Pentel Recycology line of products. Ideal for use in woodworking shops, on construction sites or other active working environments.