Profile Design-1Enjoy a warranty of 4 years of lower friction and durability, with these CeramicSpeed Wheel Kits suitable for the 38, 58 and 78 Twentyfour wheel models.Upgrade your Profile Design wheels with the performance delivered by the CeramicSpeed quality hub bearings.Choose CeramicSpeed Bearings, and feel the benefits of minimised rolling friction, strength and long lifetime. In the box:2 x 619/9 bearings2 x 61802 bearings2 x 61902 bearingsCeramicSpeed AllRound GreaseSticker sheet