Nepalese Membranophone (Spin Drum): "Damaru"

This damaru is from Nepal. The small two-headed drum, shaped like an hour glass, is  played with one hand.  Damarus are normally made from wood and typically have goat skin drumheads. Two leather or string cords come from the waist of the drum. The strikers are typically beads fastened to the ends of the cords. Knots in the leather can also be used as strikers. As the player waves the drum using a twisting wrist motion, the strikers beat on the drumhead.

The fabric of the long pendant or chopen, is typical of Nepalese brocade design, as is the fabric of the carrying case.

The damaru is an essential aid in Buddhist Vajrayana ritual practice. The shape of the damaru has its roots in ancient India -- where one side of the drum is seen to represent the male energy or Lingam, and the other represents female creativity. The Hindu god Shiva is often depicted with such an hour-glass shaped drum.
 
Source:
http://en.wikipedia.org/wiki/Damaru
http://www.garudashop.com/Damaru_s/96.htm
http://www.damaruworks.com/accessories/chopen-2/