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 for it to be self-lubricating over the lifespan of the bearing, even when ridden in the harshest of conditions . The CeramicSpeed SLT OHD Bearing is designed, developed, and hand-built in Denmark and comes with a lifetime warranty. SLT (Solid Lubrication Technology) . OHD (Optimized Headset Design)