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 reed support with two ball-like decorations. This instrument is an old phằn tỵ công (small, male) with a defective pipe support and three ornamental discs; the lower one is an octagonal metal plate. The two upper decorative discs are apparently cogwheels. The protruding funnel bears traces of repair.