After going through Kinki Amibari’s unique high temperature and pressure treatment,Koshitsu needles are carefully polished with natural plant wax. This special treatment gives the bamboo extra durability and helps prevent damage from outside environmental influences. Moreover, it has an effect of preventing the needles from warping. The surface treatment makes a comfortable and smooth movement of threads and warm touch. This is our one of the very Unique Design for knitting world Customers.