 The sport is usually played on an indoor court measuring 27 metres by 16 metres.At each end there is a 'frame' (a device similar to a trampoline off which the ball bounces) which measures one square metre and a semicircular D-shaped forbidden zone measuring three metres in radius.Each team can score on both ends of the court, and comprises 12 players, of whom 7 may be on the court at any one time.