It must not weigh more than 16 ounces (450 grams) and not less than 14 oz (410 g) at the begin of a match. The circumference of a soccer ball must not be more than 28 inches (70 centimeters) and not less than 27 ins (68 cm). There are very few fixed dimensions for soccer fields, even at the highest level. The ball must be of a pressure equal to 0.6 1.1 atmosphere (600 1,000 g/cm2) at sea level (8.5 Ibs/sq in 15.6 Ibs/sq in). FIFA only stipulates that for professional 11-versus-11 competition, the length must be between 100 yards and 130 yards and the width between 50 and 100 yards.