Sogeum

The sogeum (Korean: 소금; also spelled sogum or sogŭm) is a small bamboo transverse flute used in traditional Korean music. Unlike the larger daegeum, it does not have a buzzing membrane (although it did have one in ancient times). It is used in court, aristocratic, and folk music, as well as in contemporary classical music, popular music, and film scores.

The overall length and thickness are not constant because sogeum is made of natural bamboo, but it is 40 cm long and 2.2 cm thick.