The type of musical instrument used by flamenco dancers is castanets. These are percussion instruments used in different music such as: Italian, Moorish, Spanish, Swiss and Portuguese music. They are a hand percussion instrument which are made from a pair of concave shells that are joined on one edge by a single string.
Flamenco, as it is known today, is a music known for its fast rhythm and melodies. However, just because we picked castanets as the answer to this question, it does not necessarily mean that it is the only instrument used by flamenco dancers. Spanish guitar, flamenco guitar, cajon and palmas can also be used by flamenco dancers to accompany their rhythm while they are dancing.