It just gets more overwhelming by the day.
The lists keep growing by leaps and bounds as more and more companies are entering the ball market.
The list below is the most current balls approved for USAPA sanctioned tournament play.
Remember, that outside of playing in a USAPA sanctioned tournament, you can use any ball you please. It does not have to be on this list.
Keep in mind that if the USAPA tests and approves a ball, it is approved for both indoor and outdoor use. The USAPA does not choose nor care where you use it. The choice is up to you to use a ball that bounces and reacts the way you want it to on the surface you are playing on, and is seen as well as can be, based on the color of your playing surface and visual backgrounds.