Cricket is a bat and ball sport played between two teams, usually of eleven players each. A cricket match is played on a grass field (which is usually roughly oval), in the centre of which is a flat strip of ground 22 yards (20.12 m) long, called a pitch. At each end of the pitch is a set of three parallel wooden stakes (known as stumps) driven into the ground, with two small crosspieces (known as bails) laid on top of them. This wooden structure is called a wicket. A player from the fielding team (the bowler) bowls a hard, fist-sized cork-centred leather ball from one wicket towards the other. The ball usually bounces once before reaching a player from the opposing team (the batsman), who defends the wicket from the ball with a wooden cricket bat. The batsman, if he or she does not get out, may then run between the wickets, exchanging ends with the other batsman (the "non-striker"), who has been standing in an inactive role near the bowler's wicket, to score runs. The other members of the bowler's team stand in various positions around the field as fielders. The match is won by the team that scores more runs.