The Sanxian has a rounded body (resonator) covered with snakeskin, and it has a long, fretless neck.
丸みを帯びた形の胴体(共鳴箱)に蛇の皮を張り、フレットの無い長い棹を持つ。 - Wikipedia日英京都関連文書対訳コーパス
Furthermore, he was also excellent in Shodo (calligraphy), Chinese-style poems, Heike Monogatari Heikyoku (the music played on Heike Biwa as accompaniment for the recitation of Heike Monogatari (The tale of the Heike)) and Kokin (fretless seven-stringed zither), and also showed excellence in appraisal of utensils, and calligraphic works and paintings.
また書道・漢詩・平家物語平曲・古琴に優れ、器物、書画の鑑定にも秀でていた。 - Wikipedia日英京都関連文書対訳コーパス