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Material: Quality rubber O-rings provide durability, elasticity, and a secure fit for e-bike components. Function: Used to hold the sprocket/star wheel in place when the lockring becomes loose during operation. Fitment: Compatible with Bosch Active Line, Performance Line, and Performance Line CX BDU3xx motor systems. Size: Each O-ring measures 37mm inner diameter, 40mm outer diameter, and 1.5mm thickness for precise sealing. Package: Includes 10 rubber O-rings, ideal for repair, replacement, or maintenance of e-bike drive systems.