Model No EMA-JW1216-SHBKAL105 Catalogue Derailleur Cage Kit Key Features Alloy Derailleur Cage kit system with pulley wheel Upper:12T/Lower:16T (Shimano 105 compatible) TPiPEAK ceramic bearing - Race proven performance Molded composite material - For superior durability than metal ones Directional tension pulley - Reduce frictional power loss for quiet and smooth shifting performance Made in TAIWAN