These jo are made from Japanese oak from Kyushu (the southern part of Japan ) by NIDOME Bokuto Craft Company at Miyakonojo, in Kyushu. This company represented more than 80% of the bokken manufacturing market in Japan. Miyakonojo keeps the traditional way of manufacturing, such as  drying the wood naturally in order not to destroy the fibers of oak; therefore our bokken are solid and robust and can be used for a long time. NIDOME Company uses the wood taken from 70 years old trees.