https://www.officedepot.com/a/products/5153078/Pentel-Super-Hi-Polymer-Leads-07/
Pentel Super Hi Polymer Leads 0.7 mm Medium Point B Black Lead 12Tube 12 Box - Office Depot
Compatible with mechanical pencils B hardness for dark imprint Extra strong for less breakage Patented process for minimal breakage and less smudging Super Hi...