The berimbau itself has been a folk instrument for solo song accompaniment and worship and became a mainstay of the roda when metal wire was widely available for use as a string. Before then, berimbaus were strung with plant fibers and thus could not project as loudly as with metal (nowadays, the wire is culled from used car and bicycle tires). Brass wire was observed being used on berimbaus, though, as early as 1824 in Rio. The caxixi's inclusion with the berimbau is another recent innovation that gives the berimbau an extra bit of punch. A theory goes that berimbaus were fitted with metal blades at the top which made them a defensive weapon when playing capoeira openly (which was essentially outlawed until the 1930s) was a dangerous affair.
