Uni Nano Dia Mechanical Pencil Leads - .5mm Mitsubishi $ 3.00 F - $ 3.00 HB - $ 3.00 B - $ 3.00 Quantity This variant is currently sold out For any mechanical pencil that takes .5mm leads, the Nano Dia are smooth, strong and a pencil world favorite. Hardness: available in F, HB and B, each hardness runs a tiny bit soft Diameter: .5mm Length: 2 3/8" Quantity: 40 leads