This musical instrument takes its name ngoma from the Kongo language word for "drum." Specialized craftspeople often made these drums. The wooden base is hollow and covered with a first hide, then a second one held tight by plant fibers. This allows the sound to resonate when just the first membrane is struck. In Uganda, drums contain a ritual "heart" known only to its maker, which helps to imbue it with power. In contrast with royal drums ( mpango ), this instrument is not considered sacred. The sounds from men striking drums could be used as a kind of communication or as music in a performance setting.