This category refers to all instruments which are sounded by passing an airstream through a pipe. It has a long history in China and there are many types. The tones are all different, and the playing techniques also differ. In general, they can be subdivided into the following types: those with the airstream passing through the holes (such as the di, xiao, xun and paixiao); those with a double-reed (such as the suona and the guan); those with a reed (such as the sheng, bawu and hulushi); and those sounded by reverberation of the lips (such as the conch, the ox horn and the brass horn).
In the Hong Kong Chinese Orchestra, the wind instruments in use include the bangdi, qudi, dadi andxindi; soprano keyed sheng, alto paisheng and bass baosheng; the alto guan, bass guan and suona, etc.. Depending on the repertory, the Orchestra also incorporates other wind instruments such as the dongxiao, bawu, xun, koudi and conch.