SRAM XX1/X01 Eagle Rear Derailleur Pulley Set Assembly Description: This SRAM Derailleur Pulley Sets includes both upper and lower pulleys as well as an inner pulley cage compatible with SRAM XX1 and SRAM X01 12 speed rear derailleurs. Features: Derailleur pulley set includes upper and lower pulleys with bearing plates and pulley arm hardware Includes inner pulley cage