High quality 2B HB Lead a Refill Tube 0.5 mm / 0.7 mm Automatic Pencil Lead for mechanical pencil - AliExpress
Amazon.com : Faber-Castell 0.7mm 2B Super Polymer Premium Strong Dark Smooth Leads Mechanical Pencil Lead Refills For All 0.7 mm Mechanical Pencils (4 Tubes, 24 Leads Per Tube - Total 96 leads) : Office Products