There are generally at least eight bells and most practical consist of ten to thirteen with no more than twenty-three bells. One octave gives a narrow scope of tune playing.
The frame works in which the bells are hung is built to suit the specific requirements of the tower and can be built to suit any tower.
The ring actions can be set up manually with a hand player or played electrically from a mini keyboard piano.
Consist of an interchange of sixteen notes. Four bells are required.