world cup balls

Regulation size and weight for a football is a circumference of 68–70 cm (27–28 in) and a weight of between 410–450 g (14–16 oz). The ball is inflated to a pressure of 0.6–1.1 bars (8.7–16.0 psi) at sea level. [20] This is known as "Size 5". Smaller balls, sizes 1, 3 and 4 are also produced for younger players or as training tools. japan league cup