The CeramicSpeed Zipp 8 Coated Wheel Kit is based around friction reduction for more speed. This version is compatible with Zipp 77D/177D and 76D/176D NSW Disc, ZR1, and Cognition Disc hubs from 2015 forward. The kit comes with six coated bearings which match your Zipp hubs. This results in a lifetime that is three to five times greater than standard bearings. Due to the high velocity of bearings as you ride, this lack of friction can have a massive effect on your performance. With the CeramicSpeed Wheel Kit, you can assure that performance is as smooth as possible.