CeramicSpeed OHD Headset Kit for Specialized SL8 SL7 Allez SprintFeatures a unique combination of an oil encapsulated solid plastic polymer and stainless steel materials which results in a self lubricating, corrosion resistant, and maintenance free bearing The micropores in the otherwise solid polymer evenly distribute just enough oil to keep the bearing well lubricated, while also containing sufficient oil for it to be self lubricating over the lifespan of the bearing, even when ridden in the harshest of