Football shall be spherical and made of leather or other suitable material preferably Polyurethane.
Circumference of ball shall not be more than 70 cm (28 in) and not less than 68 cm (27 in). Football shall not weigh more than 450 g (16 oz) and not less than 410 g (14 oz) at the start of the match. Pressure in the ball shall be equal to 0.6 – 1.1 atmosphere (600 – 1,100 g/cm2) at sea level (8.5 lbs/sq in – 15.6 lbs/sq in).
Always Remember: If the ball bursts or becomes defective during the course of a match, then the match is stopped and shall be restarted by dropping the replacement ball at the place where the original ball became defective, unless play was stopped inside the goal area, in which case the referee drops the replacement ball on the goal area line parallel to the goal line at the point nearest to where the original ball was located when play was stopped. If the ball bursts or becomes defective whilst not in play at a kick-off, goal kick, corner kick, free kick, penalty kick or throw-in, the match is restarted accordingly. Additional balls may be placed around the field of play for use during a match and their use is under the control of the referee. If an extra ball enters the field of play during the match, the referee must stop the match only if it interferes with play. Play must be restarted by a dropped ball in the position where the match ball was at the time when the match was stopped, unless play was stopped inside the goal area, in which case the referee drops the ball on the goal area line parallel to the goal line at the point nearest to where the ball was located when play was stopped. If an extra ball enters the field of play during the match without interfering with play, the referee must have it removed at the earliest possible opportunity.