Bolas ( from Spanish bola , `` ball '' , also known as boleadoras ) are a throwing weapon made of weights on the ends of interconnected cords , designed to capture animals by entangle their legs . Bolas ( from Spanish bola , `` ball '' , also known as boleadoras , or Inca ayllo ) are a throwing weapon superficially similar to the surujin , made of weights on the ends of interconnected cords , designed to capture animals by entangling their legs .