Structural composition: It consists of a flat wood piece the size of a palm and a shell shape. Two pieces of wood are tied with strings and can be put on the thumb.
Material used: Made of hard wood with good sound transmission such as mahogany or ebony.
Musical instrument characteristics: It belongs to bamboo and wood body musical instruments, without fixed pitch. When playing, hang two castanets on your thumb like shells, and use one of the other four fingers to alternately hit one of the castanets to make a thump sound on the other. The timbre is clear and translucent, which can not only play simple beats directly for songs and dances, but also play a variety of complicated and wonderful rhythm patterns, with unique characteristics.