Diameter: 24cmMaterial: polyurethane foam.Solid foam ball, no need to inflate. Soft and bouncySilent basketball: you can practice dribbling silently at home.The surface of the ball has a very large number of micropores to absorb sound, you don't have to worry about disturbing your neighbors.Warning: Not suitable for children under 3 years old. Contains small parts, do not aim at eyes or face when playing, use under adult supervision. This product is an educational product, do not eat it! Pay attention to cleanlinessand hygiene and wash your hands after using this product!Caution!1. After receiving the ball, press it repeatedly for 5 minutes before playing with it, so that the elasticity and static nature of the ball will be greatly increased.2, the ball has a faint waterproof peach smell, safe and non-toxic, if you don't like it, can be burned in the sun for 3 hours, the smell will slowly disappear.3, if the ball is dirty, you can scrub the water cloth, do not add detergent, etc. soak in the water for a long time. It will cause damage to the balls and release cinders.