The Douff (akka duff) is a goat-skin tambourine without jingles. It is used in Egyptian folk music and in many popular and religious rituals (like zar, hadra, mouled, etc).
<a href="//commons.wikimedia.org/wiki/User:Nessma_Elaassar" title="User:Nessma Elaassar">Nessma Elaassar</a>
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