Shimano XT RD-773 Derailleur Pulley Set
Stock replacement pulley set for a 9 speed XT M770 series rear derailleur. It will also function as a replacement for other 9 speed Shimano mountain derailleurs, sans XTR.
The hardened resin bodies are built for longevity and ride on bushings and bearings. No real service is ever required with these pulleys except to clean and lube them.