According to FIFA - the ball is.....
* spherical * made of leather or other suitable material * of a circumference of not more than 70cm (28ins) and not less than 68cm (27ins) * not more than 450g (16oz) in weight and not less than 410g (14oz) at the start of the match * of a pressure equal to 0.6-1.1 atmosphere (600-1100g/cm2) at sea level (8.5lbs/sq.in 15.6lbs/sq.in)
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