The Emperor Cup, JFA National Football Championships only official game ball; Ball Size: Circumference: 26.8 - 27.6 inches (68 - 70 cm), Diameter: 8.7 inches (22 cm), Weight: 14.2 - 15.7 oz (410 - 450 g); *If this ball is folded and shipped, it will still remain wrinkled on the surface after inflated Please store and transport in the air inflated. Durability may decrease if used on artificial turf.