Official Rookie Rugby product. * The A XV Training Rugby Ball is manufactured out of Hydratec fabric. Meaning technical fabrics and waterproof laminations are combined to enhance the life and performance of the ball. * Training Balls are made to last longer as they are used more than match balls. They also have a hydratec barrier in their construction, which helps to repel water and dirt which helps to maintain the quality and shape of the balls. * All balls require inflation upon delivery. * Size 4 For younger players: middle school, preteen, camp and Size 3 For younger children, starter size.