 The objective of a game is to score more goals than the opposition . Goals are scored when a team member positioned in the attacking shooting circle shoots the ball through the goal ring . The goal rings are 380 millimetres ( 15 in ) in diameter and sit atop 3 @.@ 05 @-@ metre ( 10 @.@ 0 ft ) -high goal posts that have no backboards . A 4 @.@ 9 @-@ metre ( 16 ft ) -radius semi @-@ circular " shooting circle " is an area at each end of the court . The goal posts are located within the shooting circle . Each team defends one shooting circle and attacks the other . The netball court is 30 @.@ 5 metres ( 100 ft ) long , 15 @.@ 25 metres ( 50 @.@ 0 ft ) wide , and divided lengthwise into thirds . The ball is usually made of leather or rubber , measures 680 to 710 millimetres ( 27 to 28 in ) in circumference , and weighs 397 to 454 grams ( 14 @.@ 0 to 16 @.@ 0 oz ) . A normal game consists of four 15 @-@ minute quarters and can be played outdoors or in a covered stadium . 
