Pencil leads - Pencils are graded using the ‘Graphite Scale’ which measures the softness/hardness of the lead.
Box Packed Cheap Hb 2b 2.0mm Black Color Mechanical Pencil Lead
The Best Lead Grade For Every Application
Modish Fine Note 2b pencil lead winner Array Communism
DMP - Dave's Mechanical Pencils: April 2006
Pencil grades explained – Mont Marte Global
Modish Fine Note 2b pencil lead winner Array Communism
A Beginner's Guide to Pencil Grades — Your Site Title
The Gentleman Stationer
6Pcs 5.6mm Charcoal Refill Mechanical Lead Auto Clutch Pencil for
Making Sense of Pencil Leads – Cowan Office Supplies
Is a .7 lead pencil a #2 pencil? - Quora
Wholesale pencils 3h For Writing on Various Surfaces
What is the Difference Between 2B and HB Pencil?
Graphite Grading Scale Explained