This hybrid ceramic bearing features a 17 mm inner diameter, 26 mm outer diameter, and 5 mm width.It is designed for use in bicycle bottom brackets and other compatible applications requiring rotational performance.The bearing incorporates silicon nitride (Si3N4) ceramic balls paired with chrome steel rings, offering reduced friction and increased durability compared to standard steel bearings.Sealed on both sides with rubber seals (RS), it helps keep contaminants out and retain lubrication.This ABEC-1 rated bearing is suitable for general-purpose use in cycling components and various mechanical systems where moderate and smooth are required. This is an aftermarket spare.Brand and model mentions do not imply manufacturer association.