Mypickleball's note:
Pros: Plays similar to Onix indoor balls but lasts longer. eg. South East Pickleball Sorell (Tasmania) used these balls in 10oC temperatures and did not experience any cracking. A club in Melbourne with hard hitting Tongan players has also had great results ;)
Cons: The bounce is a little higher than Onix. Not approved for USAPA sanctioned tournaments.
SIWPC indoor balls offer enhanced durability for all levels of pickleball play. They also feature a dynamic bounce for ultimate performance and playability each time you step on the court.
SIWPC indoor balls are endorsed by the Sydney Inner-West Pickleball Club, though they are not approved by the USAPA for tournament play.
SIWPC balls are available in yellow, green, orange and white.