"Reed aerophones is one of the categories of musical instruments found in the Hornbostel-Sachs system of musical instrument classification. In order to produce sound with these Aerophones the player´s breath is directed against a lamella or pair of lamellae which periodically interrupt the airflow and cause the air to be set in motion.
422 Reed aerophones
422.1 Double reed instruments - There are two lamellae which beat against one another.
422.11 (Single) oboes.
422.111 With cylindrical bore.
422.111.1 Without fingerholes.
422.111.2 With fingerholes.
Duduk
Piri
422.112 With conical bore." - (en.wikipedia.org 31.05.2021)
en