When the pan flute is played, the air flows out from the top and hits the other side, causing the inner tube wall to vibrate, thereby producing music. The pan flute is adjustable, you can adjust the pan flute to the melody you want. The 18-hole panpipe has more tubes and sound holes, which can produce more tones and sound effects. Each pipe has a tight cork that can be manually calibrated. This is a simple and easy to learn pan flute for adults, one of the favorite instruments for beginners, professionals and music lovers