The tumdak is a hand-struck double-headed membranophone of the Santal people of the Indian subcontinent, distributed across Eastern India and Bangladesh.
Like many similar Indian drums, each head has a round patch of tuning paste in the center which enhances the sound.
When played for dancing, the Tumdah' player suspends the drum around his neck with a cord or leather strap.
The Tumdah' falls within the larger category of double-headed hand-struck Indian drums, which have various names: Dholak, Nal, Mridangam.
The player strikes the Tumdak' with full hand and fingers as required by the musical pattern.