The Gilbert ® Spectra Ball is a high quality training/match ball designed to provide outstanding performance in all conditions. Suitable for all surfaces and a great option for county use. Size 4 is recommended for players 11 years old and under.Play on any surface suitable for indoor and outdoor use.Inflate using standard pump (not included)Product Care: Check PSI before each use. Avoid rough surfaces. Do not sit on balls. Rotate balls in your kit to ensure even usage. Inflation: Pull into shape moisten needle inflate to recommended PSI.