timpani
Timpani, or kettledrums, are musical instruments in the percussion family. A type of drum, they consist of a skin called a head stretched over a large bowl traditionally made of copper. They are played by striking the head with a specialized drum stick called a timpani stick or timpani mallet.
Foe more information click here:
http://www.dsokids.com/listen/instrumentdetail.aspx?instrumentid=15