●Recommended ball by the Japan Dodge Ball Association (light and low impact impact so you can enjoy it without fear of the ball.) ●#1 Ball Fit: Elementary School Lower School (Lightweight) ●Size: Circumference: 22.4 - 23.2 inches (57 - 59 cm); Diameter: Approx. 7.1 inches (18 cm); Weight: 6.1 - 7.1 oz ( ●Material: Rubber, Thailand, anti-seep valve