The Precision Street Mania Football is really tough skinned specifically designed for use on hard abrasive surfaces such as a street or playground. Size 4 is recommended for children aged between 9-14 years old.Inflate using standard pump (not included)Do not over inflate. Moisten the needle before insertion to protect the valve. Store away from direct sunlight and extreme temperatures. Ensure balls are clean and dry before storing and keep in a ventilated bag.