Castagnets made of wood. They are good for playing fast rhythms. Normally used for flamenco.
Castanets (from Spanish castañuelas) or castanhetas are a percussion instrument that was known for three millennia. In Andalusia, Spain, it has become a national instrument. It consists of two pieces of chestnut wood in the shape of a deep dish, perforated and ornamented with a ribbon that is placed around the thumb. Its name derives from its shape, which resembles a chestnut.