SRAM XX1/XO1 12speed derailleur pulleys Genuine SRAM replacement pulleys for XX1/XO1 Eagle 12-speed rear derailleurs. Each pulley features ceramic bearings to ensure that they continue to spin fast and smooth for many miles. Pulleys are easy to replace and can make a huge difference with the performance of your drivetrain. Features OE replacement for SRAM XX1/XO1 Eagle rear derailleurs Ceramic bearings spin ultra-smooth | Sram | Eagle Xx1/x01 12Sp Ceramic Pulleys Rear Derailleur Ceramic Bearing Pulleys