Pentel (C505-2B) Super Hi-Polymer Lead Refills. 5MM, 2B / 1 Tube of 12 Leads Receive within 1-5 Business Days! Super Hi-Polymer Lead Refills, 0.5mm, 2B, Black, 12 Leads per Tube PENCILS - LEAD REFILLS and ERASERS Manufacturer's limited lifetime warranty.