Apparently they are made out of bamboo and black powder and is a 1500+ year old tradition, a rocket to goods of the sky asking for rain or something.
The relly big one's also have huffing and puffig sound like steam train.
https://youtu.be/XDpl2JD9km4?t=1730 Sometimes it do as it wants to
https://youtu.be/XDpl2JD9km4?t=2631And also they have a bamboo missile festival.
Big enough to easily take down a jet liner.