Elevate your mechanical performance with these premium hybrid ceramic ball bearings. These 6902 2RS bearings feature a precise 15mm inner diameter, 28mm outer diameter, and 7mm width, making them ideal for high-performance applications. The innovative design combines chrome steel rings with advanced silicon nitride ceramic balls, delivering exceptional durability and wear resistance. The dual rubber seals (2RS) effectively protect against dust and debris while maintaining proper lubrication. The nylon cage ensures smooth ball guidance and optimal operation. These bearings excel in demanding conditions where traditional steel bearings may fall short, offering reduced friction and superior performance. Perfect for precision equipment and high-speed applications, particularly in bicycle components where reliability is crucial. Pre-lubricated with high-quality grease for immediate use, these bearings provide smooth, quiet operation and extended service life.