The CeramicSpeed SLT (Solid Lubrication Technology) Bearing for Rear Derailleur Pivots: OPD (Optimized Pivot 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 of the otherwise solid polymer evenly distribute the right amount of oil to keep the bearing perfectly lubricated, while also containing enough oil to ensure its self-lubrication for the entire lifespan of the bearing – even when used in the most extreme conditions. The CeramicSpeed SLT OPD Bearing is designed, developed, and hand-built in Denmark and comes with a lifetime warranty. For more product information: SLT