Sram Ceramic Bearing Pulleys XX1 11-SpeedSRAM Ceramic Bearing Pulleys XX1 11-Speed is great if you are replacing or upgrading your worn pulley set. These rear derailleur’s upper and lower pulleys reduce friction, increase stiffness and add durability. The pulleys are made to last with sealed ceramic bearings and 12 teeth. The pulleys come with 10ml of grease.710845724428
