See seven replica flutes. Six flutes from top of them are made of well smoked bamboo. A bottom flute is made of clay. Note measurement of their scale. No.1 is top and No.7 is bottom.
Many note are simple fingering, except two cross fingering.
The newspaper says that oldest wooden flute. They says there are few rationable behind. Because you can not find any connection with other old flutes. And because of thier strange form. You can see one of these flutes now in Yokohama Musium.