The most popular club match ball in the world, The Mitre ® Ultragrip Netball has excellent durability and grip. Size 4 is recommended for players 11 years and under. Size 5 is recommended for players 11 years and over.Plays beautifully on all surfaces and in all conditions.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.