What do Spanish dancers hold in their hands?

The modern castanet comprises a pair of shell-shaped flattened wooden clackers which are held together with a single loop of string or thin leather. The leather is doubled and the thumb is placed through it, and the pair of castanets then hangs freely from the thumb and is manipulated by the fingers and the palms.

Accomplished castanet players can make a variety of noises with the castanets, from a flat "click" to a warm roll. Castanets are always played in pairs, and each pair is tuned differently. The higher-pitched pair (known as "hembra," or "female") is traditionally held in the right hand and the lower-pitched pair (known as "macho," or "male") is traditionally held in the left hand.

Though many people associate the castanets with flamenco, they are not a traditional element of flamenco music or dance; rather, the castanets are an integral part of folkloric Spanish dances, primarily Sevillanas and Escuela Bolera dance.