To choose a flute, you should first choose bamboo, and see if there are few black fibers in the bamboo in the finger hole section, and some bamboo will be older, so that the flute will be durable. Secondly, you should look at the weight. The weight of a good flute is often biased (it is another matter to have a metal joint). Again, it depends on the pipe diameter, perfect circle or ellipse. The most important thing is to listen to the sound, the high notes are crisp, the deep bass is the top grade, and Dong Xuehua should be clearly marked.