A bedug is a large double-barreled drum with water buffalo leather on both sides.
Unlike the more frequently used kendang, the bedug is suspended from a rack and played with a padded mallet and is not adjustable. The bedug is as large or larger than the largest kendang and generally has a deeper and duller sound. The drum has pegs holding the two identical heads in place similar to the Japanese taiko.
The bedug is not used in most gamelan performances. It is used in special ensembles like the gamelan sekaten, where it takes the place of the kempul. In some pieces it is played along with the kendang, especially to accompany dancing.
The bedug is commonly used in mosques in Java among Javanese and Sundanese people to preclude the adhan as a sign for prayer or during Islamic festivals. For example, the sound of a bedug is used to signal the end of the daylong fast during Ramadan and sometimes it is used to signal time for Suhoor during Ramadan. When used to signal time for Friday prayer, the bedug is beaten in a different way than for ordinary prayers. The bedug is also used to celebrate takbiran, the night before Eid ul-Fitr when people chant takbir and hit the bedug in Indonesian Lebaran tradition.