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Among the Yaka (in the Democratic Republic of Congo) this slit drum is used by a ngoombu diviner. In case of illness or accident the ngoombu is responsible for determining the cause and making recommendations. This slit drum is also used in divination.
By hitting the N'koku ngoombu with a stick, spiritual powers are invoked and the cause of the misfortune is 'translated' for the person affected.
Characteristic of the Yaka drum is the shape of the handle. It consists of a typical Yaka head, with large eyes and downcast eyelids, a small, open mouth and large, round ears on both sides.