"Product Information" This is a standard model from Gilbert, perfect for practice at rugby schools and other training sessions. It is the successor to the previous ZENON series. *Please note: This ball is not certified by the Japan Rugby Football Union and cannot be used in official matches. "Main Specifications" Training ball from Gilbert, England. Made with durable rubber for excellent grip. Not sold in Japan. Shipped deflated. Size 4 ball: For upper elementary school students. *The image is of a size 5 ball.