J&L Ceramic Bearing*6 for Zipp 77D/177D Disc Brake Hub 202,303,404,808&30 Course

Ceramics Bearing:2pcs for Front Hub, 2pcs for Rear Hub + 2pcs for FreeHub. Race Material: P6 bearing steel. Ball Material:Nitrided Silicon Ceramic SI3N4. 1 years of warranty for proper usage only.

eBay