Noise Protection for internal cable routing!capgo have developed an easy to install noise reducing \'sleeve\' that simply slides over cable housings to reduce noise from internal cables/hoses moving in a frame. Key Features: Protects brake and shift housing, routed inside a bike frame, from noise and rattling,Superlight,Easy and quick assembly, resistant against brake fluid,Suitable for all bike styles,. Specification: OL level product,Length - 2m,Shift: ID - 4.5mm, OD - 9mm .