The clay used for Jian pottery is very high in iron and requires a very high temperature for firing. Kilns used for firing this style of teaware are not easy to make and thus are incredibly precious.
Tea status record: "If you want to whisk tea, you must first warm the bowl. If it is cold, the tea will not float. The body of rabbit's fur bowls is thick, so they retain heat for a long time and are very suitable for use ."