The Dao people in the mountains of northern Vietnam use insect cocoons as mouthpieces for musical instruments. The body of their oboes corresponds to the Chinese so-na with seven frontal tone holes, which are located in indentations that are not turned but cut by hand, the thumb hole between the first and second finger holes, lip disc and slide with two ball-like decorations. The pipe support of this Phằn tỵ nhẩy (large, female) bears an auspicious red band above the lower end disc.