Leather or parchment is tightened to the top of a large pottery or wooden jug. A reed or horsehair is fastened to the cover. The one with horsehair is called bull (bika) by the Csángós. A wet hand moved up and down the reed or horsehair creates a unique sound of percussion. It is used with other instruments.

Source: “Hungarian Folk Musical Instruments” by Emese Kerkay, Amerikai Magyar Múzeum (Hungarian Heritage Center), Passaic, New Jersey, 2002.