The Koi series is Truman's all-solid small violin series, with different barrel shapes and sizes of 36-inch MINI/38-inch TP, which is very friendly to musicians who like smaller violins. The all-solid configuration allows them to experience a unique playing experience. On the rosewood fingerboard, two vivid Koi patterns are inlaid with red rosewood and large-leaf golden nanmu, hoping to bring good luck to the player.