SHIMANO Dura Ace FC R9100-P Power Meter Crankset Magnet Set.
The magnet set is for measuring the cadence using the Shimano Dura Ace FC-R9100-P Powermeter crank. The magnet can be attached to the chain stay, seat tube or down tube.
Original Shimano parts guarantee that all components work perfectly for optimum performance and maximum safety and longevity.