Qudi, China, early 20th century. Transverse, bamboo flute with bone end-caps. Inscribed in red ink with imitation Chinese characters. Twenty-four bands of silk thread coated with black lacquer. Traditionally, a thin, vibrating membrane (dimo) is peeled from the interior of a bamboo stalk and adhered to the flute using peach sap, giving the qudi its characteristic buzzing sound. Longer flutes like this are often played in the kunqu opera, where they are called kundi.