the ogene type of bell which is commonly used as a "master instrument" in a bell orchestra in the omambala river basin of the igboland. it is an instrument of the struck idiophone class and is made of iron by specialist blacksmiths. the bell has a flattish, conical shape, and is hollow inside. the sound itself comes from the vibration of the iron body when struck, which is made to resound by the hollow inside of the bell. the iron body is usually struck with a soft wooden stick.