Edge tools (knives and scissors) made in Tanegashima are famous as traditional handicrafts in Japan. The crafts-men in Tanegashima had been keeping traditional technique to forged and sharpening iron long term. Tanegashima was famouse for producing center of sand iron. So the technique had been developed since roughly when (Taira clan) were marooned from Kyoto by (Minamoto no Yoritomo). When they were marooned, They take along with various crafts-men or chefs from Kyoto. Tanegashima knives are difficult to be chipped and easy sharpening (whetting). It is rare knives.