Jo-yachi is another kind of Tsuboya ware that is glazed and baked at approximately 1200℃. Jo-yachi ware includes crockery for daily use, such as bowls, pots, plates, and teapots, as well as awamori containers, such as dachi-bin (hip flask) and karakara (awamori flagon), and vases.

Following ash-glazed bowls chronologically shows the genealogy of jo-yachi. Ash-glazed bowls include three types: those making a straight line from the foot to the rim (Style I), those curving inward (Style II), and those warping outward (Style III). According to the classification, style I is found in the early works of Wakuta ware, style II in the works during the unification of the three kilns, and style III in the early works of Tsuboya-yaki.

Reprinted from Kaiyuwan kara Mita Kinsei Okinawa Koyo no Hennen (Tentative Chronology of Okinawan Kiln [Wakuta, Tsuboya, and Kogachi] According to Style of Ash Glaze Bowl) by Chinen Isamu, Ikeda Yoshifumi and kazuyuki Eto.