These pencils are made from the finest Hardtmuth Graphite. They feature high opacity and are clean erasing. With a wide range of hardnesses, these pencils allow artists to create dramatic effects in their illustrations, drawings and sketches. These pencils are offered in 2 lead diameters: F, H, HB, 2H-10H & 2B have 2mm leads. 3B-8B have 2.5mm leads