The tumbak is basically an Indian version of the Dumbek. The tumbak is not very common in most of India, but it is found in the folk music of Kashmir. It is interesting to note that drums of this type are also known as klong yao or glong (Thailand & Laos). There is a certain similarity in form to the gummeta of Andhra Pradesh.
Selected Video
Other Sites of Interest
Folk Drums and Tribal Girls: Sounding the Himalayas in Indian Film
Drums of India: A Pictorial Selection
The "Dḩāk", Devi Amba's Hourglass Drum in Tribal Southern Rajasthan, India
The Role of the Phariya in Tribal Acculturation in a Central Indian Market
Bower: Drums Behind the Hill (Book Review)