For the SRAM AXS 
C-Bear Ceramic Bearings is a Belgian bearing specialist for ceramic ball bearings with the best smooth running properties, durability and accuracy of fit. All bearings work without additional spacers and washers.
Note from the manufacturer:
Only approved for use on the road.
1 x tension pulley C-BEAR SRAM AXS 
1 x guide pulley C-BEAR SRAM AXS 
| Color: | Silver | 
| Weight: | 26g | 
| Activity: | Cycling | 
| Groupset: | SRAM AXS (electronic) | 
| Material: | Aluminium, Ceramic | 
| Item code: | CBE570416 | 
| Model year: | 2022 | 
| Manufacturer: | C-Bear | 
| Product name: | C-Bear Derailleur Pulleys - Ceramic Bearings | 12-speed | for SRAM AXS Road | 
| Weight source: | BIKE24 | 
| Shifting system: | 12-speed | 
| Usage bikesport: | Road Bike, Time Trial, Triathlon | 
| Manufacturer page: | https://www.c-bear.com | 
| Manufacturer item code: | pull-axs-rd-alu-fc | 
| Rear derailleur accessories: | Jockey Wheels |