Slit-gong
The 'slit-gong' is a log drum used throughout Africa, Southeast Asia, and Oceania. A whole log is hollowed out through a narrow slit running the length of the log. Usually one side has thick walls, one side has thin ones. When the gong is beaten with padded sticks, a range of penetrating musical notes can be produced, depending on where and how the gong is struck. The gong may be carved into various pleasing or significant shapes.