The CeramicSpeed Campagnolo 2 Wheel Kit is based around friction reduction for more speed. This version is compatible with Campagnolo or Fulcrum rim brake cassette bodies with the exception of the Fulcrum R5. The kit comes with two bearings which match with the cassette body. This results in a lifetime that is three to five time 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.