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Set of 10 replacement O-rings designed for the battery cap, compatible with 4iiii Precision 2 power meter non drive side. Made from a tougher rubber material to improve resistance against wear and abrasion. Size:19x17x1mm.Provides a tighter seal to prevent water ingress and protect the power meter. Ideal for replacing worn or split original O-rings which are softer and prone to damage. O-ring only, battery cap not included. This is the Non drive side O ring.Suitable for bicycle power meter maintenance.