Timpani (/ˈtɪmpəni/;[2] Italian pronunciation: [ˈtimpani]) or kettledrums (also informally called timps)[2] are musical instruments in the percussion family. It is a type of drum categorised as a semispherical drum, they consist of a membrane called a head stretched over a large bowl traditionally made of copper. Most modern timpani are pedal timpani and can be tuned quickly and accurately to specific pitches by skilled players through the use of a movable foot-pedal.