The high-carbon steel has about 1 to 1.5% carbon while the low-carbon iron contains about 0.2%. Steel that has a carbon content between the high and low carbon steel is called bu-kera, which is often resmelted with the pig iron to make saga-hagane, containing roughly 0.7% carbon. Most of the intermediate-carbon steel, wrought iron and resmelted steel will be sold for making other items, like tools and knives, and only the best pieces of high-carbon steel, low-carbon iron, and pig iron are used for swordsmithing.