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The spherical ball used in football, as opposed to the oval ball used in rugby and American football, allows a high degree of 'kicking skill' to be achieved. Contact with the football can be developed to a stage where its flight and direction can be very accurately controlled. The precision demonstrated in footballing skills today is dependent upon top quality footballs being produced worldwide to standards enforced by the International Board set up by FIFA.
Laws of the Game
A football used for a professional match must always be the right size, weight and pressure. The footballs are always provided by the home club.
Law 2 states:
The ball shall be spherical, the outer casing of leather or other approved materials. No material shall be used in the construction which might be dangerous to the players. 
At the start of the game:-
- The circumference of the ball shall be not less than 27 nor more than 28 inches (68.5 - 71cm)
- The weight of the ball not less than 14 nor more than 16 ounces
- The pressure of the ball shall be equal to 600-1100 gr/cm2.
Law 5 states:
The referee shall decide that the ball provided for the match meets the requirements of Law 2.
The bounce of a football, which complies with the laws, is usually 30%-35%. This means a football dropped from a height of 10 metres should bounce back up to a height of 3 to 3.5 metres.
Although the laws specify the material, shape, size, weight, and pressure of the football, there is no standard for the amount of bounce.
These precise requirements are made possible because of modern methods of manufacture. This has not always been so.
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