Play up to 5x longer with the same balls
For 3 tennis or padel balls
Use any bicycle pump (read instructions)
Pressurize up to 2.5 bar
Store your tennis and padel balls under high pressure and prevent them from deflating. This way you play 5 times longer with your balls, stop spending unnecessary money on new balls.  Simply add pressure with any bike pump and they will be strong and fresh when you want to use them again.