Various kinds of ji, such as one to which a supplementary small prop is attached, one where foot propping the string of the highest note is modified or one which is designed to prevent it from falling, are in use.
補助的に小型の柱や、最高音弦用の脚部に変化を加えた柱、その他倒れにくくしたりするために工夫が施された特殊な柱なども種々使用される。