Idakka and udaku (udakai) are hour-glass drums from south India.
They are very similar to the damaru which is found throughout India.
Where the damaru is played by rattlingknotted cords against the
resonators, the idakka is played with a stick and the udaku is
played with the hand. The udaku is structurally different in that it
has a small snare made of hair, fishing line or similar material
stretched over one side. Like the damaru both the udaku and the
idakka's pitch may be bent by squeezing the lacing in the middle.