Lightweight-4Upgrade your wheels with a CeramicSpeed Wheel Kit to reduce friction, increase performance and get the most out of your LightWeight Wheels. CeramicSpeed Wheel Bearings have a proven lifetime, which is 3-5 times longer than standard wheel bearings.The high velocity of wheel bearings means that bearing friction can have a huge impact on performance. The result is higher top speed.In the box:2 x 61903/18 bearings (front)2 x 61802 bearings (freehub)2 x 61902 bearings (rear)CeramicSpeed AllRound GreaseSticker sheetCompatibility This kit is compatible with Meilenstein Disc and Wegweiser. If you need help finding the right kit for your wheels/hub, please don't hesitate to reach out to us directly and we will help you define the right kit or single bearings.