XH&reg; Bearing Jockey Wheel Rear Bike Derailleur Pulley GUB JY-C11S for Shimano/SRAM 11 tooth for Shimano, SRAM or Microshift. Superlight Jockey Wheels Bearings High quality replacement jockey wheels. Bearing: High rolling sealed bearings Teeth: 11T. Weight: Approx 11g Material: Aluminium alloy