The pei pok (Khmer: ប៉ីពក) is a Cambodian bamboo free-reed pipe.[1][2]
This instrument and the pey au (or pei ar) are both used in the Krom phleng arak.[2]
Ung, Chinary (1979). Cambodia Traditional Music (PDF) (Media notes). Tribe Music, Folk Music, and Popular Dances, Ethnic Folkways Records FE 4082. New York: Ethnic Folkways Records. p. 2. Retrieved 26 October 2018.