To ensure your ball's best performance and longevity, balls should be inflated to exactly 9.5 psi.
Before use, check your ball's air pressure as changes can occur due to the natural materials used in the bladder of the ball as well as changes in external climate.
Be sure not to over-inflate balls as it causes them to lose their shape which affects performance. Once over-inflated, a ball never returns to its original, optimal shape.
A stirrup pump (or another hand pump) is recommended to inflate the balls. Compressor pumps can lead to over inflation.
If you need to purchase a pump, you can find them on our site here.