With a hexagonal barrel, you gain greater precision for drawings. Hard (H) degrees have a 2.2 mm core for sharp lines. Black (B) soft degrees use a 3.5mm core for more delicate lines. Choose the pencil that works for you. Derwent offers a comprehensive range of 20 degrees to help achieve your vision. This set contains 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, and 4H