●Recommended ball by the Japan Dodge Ball Association (light and low impact impact so you can enjoy it without fear of the ball.) ●Size 0 ball: For toddlers and elementary schools (light weight) ●Size: Circumference: 19.3 - 20.5 inches (49 - 52 cm); Diameter: Approx. 6.3 inches (16 cm); Weight: 4.6 - 5.3 oz ( ●Material: Rubber, Thailand, anti-seep valve