Pentel CH13-B 1.3mm B Super Hi-Polymer Refill Lead, Tube of 8 Leads. Hi-Polymer Lead Refills produce crisp lines of consistent darkness, smoothness and density in 1.3mm mechanical pencils. B hardness lead is excellent for all general writing, arts and crafts and industrial use. Each super-strong lead writes as far as an entire wooden pencil and produces a super bold dark line. An 8-piece tube is equivalent to 8 wooden pencils. For use with Pentel pencil P2AAM13C.