If you bought the previous version of the Valve Index cups, you are now able to get this V9 upgrade.
Why this version?
Because we had some feedback regarding poor tracking quality.
So we optimized the design to reduce loss of tracking, and to prevent covering up the controller' sensors.
How do I know if I have the previous version?
If you have no information visible on the external parts, you actually got the first versions.
If you have a "V9" inscription on the cups you already own, you don't need this upgrade!