Upgrade your ENVE wheels with a CeramicSpeed Wheel Kit to reduce friction, increase performance and get the most out of your ENVE Wheels immediately.CeramicSpeed Wheel Bearings have a proven lifetime, which is 3-5 times longer than standard wheel bearings. Choose the ENVE wheel kit with the CeramicSpeed coated bearings and you will experience an even lower friction and prolonged lifetime in the coated version. In the box: 4 x 17287 bearings 2 x 61902 bearings All Round Grease Decal Remember to add grease and mount seals before installation.