The Gilbert ® Apt Training Netball ball is a hardwearing entry level ball perfect for outdoor use. Size 4 for is recommended for children 11 years old and under.Inflate using standard pump (not included)What's in the pack?12 x Gilbert APT ball Size 41 x Gilbert breathable ball bagProduct 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.