The Mitre ® Attack Netball is a hugely popular and widely imitated training ball - perfect for all conditions. Great for individual skill development and team training sessions. Size 4 is recommended for players 11 years and under. Size 5 is recommended for players 11 years and over.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.