Experience superior performance with this premium hybrid ceramic ball bearing. Featuring a 17mm inner diameter, 28mm outer diameter, and 7mm width, this MR17287 2RS bearing combines chrome steel rings with advanced silicon nitride ceramic balls. The dual rubber seals protect against debris while retaining optimal grease lubrication. The nylon cage ensures smooth operation and proper ball spacing. These bearings excel in demanding applications where traditional steel bearings may fall short, offering reduced friction, lighter weight, and exceptional wear resistance. The ceramic ball construction provides excellent electrical insulation properties while maintaining high precision and reliability. Perfect for high-performance bicycle applications and other precision mechanical systems requiring superior durability and smooth rotation. The hybrid design merges the best qualities of ceramic and steel components for optimal performance across a wide range of operating conditions.