Derailleur Cage KitAll products of Derailleur Cage Kit SHIMANO Carbon 12/16T » PreviousNext » Model No EMA-JW1216-SHBKCB Catalogue Derailleur Cage Kit Key Features Carbon Derailleur Cage kit system with pulley wheel Upper:12T/Lower:16T (DuraAce Ultega compatible)TPiPEAK ceramic bearing - Race proven performanceMolded composite material - For superior durability than metal onesDirectional tension pulley - Reduce frictional power loss for quiet and smooth shifting performance Made inTAIWAN