Shimano XTR Rear Derailleur Pulley Set Description: Replace worn-out pulleys and add smooth and efficient pedaling back into the ride. Includes one tension pulley and one guide pulley for a Shimano XTR 12-Speed Rear Derailleur. Features: Precision sealed bearings in both guide and tension pulleys to keep the drivetrain smooth and friction-free One tension pulley and one guide pulley Compatibility: RD-M9100 RD-M9120