Ceramic Speed OHD Kit for ENVE MELEE, FRAY, MOGThe CeramicSpeed SLT (Solid Lubrication Technology) Bearing for Headsets: OHD (Optimized Headset Design), features 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