This is a khaen, a traditional musical instrument, purchased 35 years ago at a musical instrument store in Phuket, Thailand. It is 98.5 centimeters long, 16 centimeters wide, and 7 centimeters thick. It was used for display during lectures to compare it with the Japanese sho. I am selling it because I no longer use it. I haven't used it much because I don't know how to play it.