The chocalho, chapinhas or rocar, is a percussion instrument. In Portuguese, the word "chocalho" is a generic term for shaken instruments, which also covers seed-filled Ganzás (or shakers). It consists of a frame or neck on which rods support small bells. The rocar is mainly used in samba drums. This type of instrument can vary greatly in size, shape and dimensions depending on whether it is played in one of the styles of samba and where its instrumental function also varies according to schools, arrangements...