Amazon.com : Pentel® Super Hi-Polymer® Leads, 0.5 mm, HB, 30 Leads Per Tube, Pack of 3 Tubes : Mechanical Pencil Refills : Office Products
MONO Graph Mechanical Pencil Lead Refill, 40-pieces, HB, 0.5mm
Pentel Champ Mechanical Pencils - HB Lead - 0.5 mm Lead Diameter - Refillable - Black Lead - Black Barrel - 24 / Pack - Lewisburg Industrial and Welding
Staedtler Mars Micro Carbon Pencil Lead - 0.5 mm - HB | JetPens
Uni Smudge-Proof Leads 0.5mm - Refills for Mechanical Pencil (HB/B/2B)