The ganza or shaker is used in practically all Brazilian rhythms. The instrument consists of a brushed aluminium cylinder, filled with small metal balls which produce a rustling sound. The pitch and volume of this sound depend on the dimensions of the ganza.
The ganza is played by shaking it in a way that forms the distinctive samba groove, with a good sense of timing. Because of it's small size and low weight, the ganza is a formidable instrument to allow players to dance freely whilst playing.