Aside from the fact that they are beautiful, they were amazing players, too.
The drums are headed with goatskin on one end and buffalo hide on the other. The drummers mirror each other, with their upper hands on the goatskin head and a drumstick in their lower hand beating the buffalo skin.
The rhythms were complex. They were layering 4 different rhythms at a time. It was really amazing!
I am going to try and find out about buying one of the drums and maybe set up a lesson with these guys next time I am in Vietnam.