Polaris Secondary Roller Bearing
If you are ordering from the states order from Ride Fast Company here:
https://ridefastcompany.com/pages/polaris
Fits all Polaris Team Rapid Reaction TSS-04 Secondary Clutches 2010-current.
These roller bearings allow the spring cup to freely rotate allowing the secondary spring to rotate slightly as it compresses/decompresses which eliminates spring bind and reduces friction. This allows for the smoothest shift out and most consistent clutching giving you the best performance out of your clutches possible