Some call this OverSize, C-Bear simply calls it Original Cage Max, C-Bear Ceramic OCM.

C-Bear Ceramic Aluminum Shift Wheels with full ceramic bearings for Shimano 10/11-speed rear derailleurs. Shifters are the fastest rotating bearings on your bike. Upgrading to ceramic bearings is therefore the most effective upgrade.

Specifications
Suitable for the following rear derailleurs:
Dura Ace R9100, R9150 Di2
Ultegra R8000, R8050 Di2
GRX
XTR M9000
XT M8000
SLX M7000
105 R7000

C-Bear Ceramic Bearings is a Belgian bearing specialist for ceramic ball bearings with best smooth running properties, durability and fitting accuracy. All bearings work without additional spacers and washers.

Note: Not compatible with the Shimano DURA-ACE FC-R9200 rear derailleur.

Mfr Claimed Weight
TBC