Dulu, the Li people blow their breath and sing their musical instruments. Li language is also called cluster. It is called Dongxiao in Chinese. It is popular in Qiongzhong, Baoting, Ledong, Changjiang and Haikou in Hainan Province.

The Dulu tube body is made of thin bamboo tubes with bamboo knots on the upper end. The tube length is 90 cm and the diameter is 1.8 cm to 2 cm. There is a sounding hole at the bamboo joint of the upper end of the tube, and four sounding holes (the first three and the last one) are opened at the lower part of the tube body. The first hole is opened at 1/4 of the pipe body, the back hole is opened at 1/2 of the pipe body, and the second and third holes are opened on the trisecting line from the first hole to the back hole. The exterior of the tube body is painted with traditional red and black patterns, which are both unique and beautiful.