The CeramicSpeed SLT (Solid Lubrication Technology) Headset Bearing: OHD (Optimized Headset Design), features a unique combination of a solid plastic polymer encapsulated in oil and stainless steel materials, resulting in a self-lubricating, corrosion-resistant, and maintenance-free bearing. The micro-pores in the otherwise solid polymer evenly distribute the right amount of oil to keep the bearing well-lubricated, while also containing enough oil to ensure self-lubrication for the entire lifespan of the bearing – even when used in the most extreme conditions. The CeramicSpeed SLT OHD Bearing is designed, developed, and hand-assembled in Denmark and comes with a lifetime warranty. For more product information: SLT Includes: 1X OHD Bearing 1-1/2" 40x52x7mm 45/45° 1X OHD Bearing 1-1/2" 42x52x7mm 45/45°