Pentel Super Hi-Polymer Leads are one of the strongest and highest quality series of leads on the market. Formulated under an exclusive process to improve strength yet retain blackness and smoothness. These leads require only light pressure to create dark, clean lines. Super Hi-Polymer formula reduces the risk of lead breakage and consequently saves lead. Packaged in plastic tubes. Twelve leads per tube. HB leads available in a 30 lead tube in 0.5mm and 0.7mm. Pentel colored mechanical pencil leads are noted for their strength, resilience and density. Created with a special composition that results in a very strong and flexible lead. Twelve leads per tube.