Diameter: 18 cm. The Sport-Thieme Dodgeball Kogelan Hypersoft is a soft, air-filled ball made from a special Kogelan material blend. The soft material makes this ball particularly grippy – ideal for catching and throwing in dodgeball. Additionally, players do not have to worry about injuries from failed catches or body hits. It is comparable to foam balls but is more robust and has better bounce and flight characteristics. You can adjust the air pressure via the needle valve to influence the bounce behavior. If you want the ball to bounce less, simply reduce the air pressure. This ball is suitable for both indoor and outdoor use. Usage: Play. Sport: Ball. User: Students/Mini. Material: Kogelan material blend. Color: Blue. Circumference: 56-58 cm. Diameter: approx. 18 cm. Weight: approx. 120 g.