The Mitre ® Oasis Netball is a very popular training ball with exceptional durability for a great price. Size 5 is recommended for players 11 years and over.Use indoor or outdoor.Inflate with standard pump (not supplied)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.