This Molten® dodgeball has a soft feel helping to alleviate the fear of injury. Ideal for school use.Rubber.Butyl bladder.Size 3.Diameter: 7"".Please note: When inflating a ball with a pump it is critical that the needle is lubricated before insertion.Inflation: All balls have the correct pressure printed around the valve. Correct ball inflation is important to maintain a technically superior product.