Today new technologically advanced systems, allow the possibility of playing the bells both electrically and manually. However many bell towers have not yet installed the new system and are obliged to continue to use the old electric only system. The electric system needs very expensive maintenance and can damage the towers. The bells are cast from 75% copper and 25% tin bell metal using traditional methods of a loam covered core and outer cope. Complex decoration of a religious nature is applied to the mould. The towers are tall with the bells installed at the top. The bells may swing through the tower openings and the sound is much louder than enclosed bell chambers. The clappers are wired on with a safety rope, a broken or detached clapper must not become a missile in the streets surrounding the tower. A heavy counterbalanced headstock reduces the forces on the tower and leads to a slower turning bell. The headstock carries a steel wheel with the rope attached at 3 o'clock rather than the higher 2 o'clock attachment in the English style. No stays or sliders are supplied, the bell must be held at balance when not ringing. The rope is steel which removes the problem of stretch when the bells are rung from ground floor ringing chambers. Being less flexible than natural fibres the steel rope is attached to the wheel with a toggle mechanism rather than being led through a garter hole. The rope is terminated in a natural hemp rope where it is handled. The ropes are plain without the sally associated with English style hanging. Since the bells are called according to music, the ringers do not need to see each other as a circle. The ropes fall therefore wherever is most convenient for the bell hangers. Since there is no provision for the bells to be retained in the up position, each piece or "concerto" starts with the bells being raised. The bells are either raised sequentially with each bell joining in the rounds in turn, or just pulled up all at once. The "Maestro", or conductor, calls out each bell or bells to ring. The Maestro does not handle a bell and will read from music. They play slowly moving tunes, not the continuous change ringing of the English tradition. The "Maestro" calls out the bells, including two and three bell chords. Each bell uses whichever stroke is available, the ringers holding the bells on balance when not required. The concerto ends with a flourish of chords. Once the concerto is complete the bells are rung down all at the same time, sometimes with the ringers leaving the tower whilst the bells just sort themselves out.