Pulley for the latest generation of Shimano derailleurs: Dura Ace R9100, Ultegra R8000 and 105 R7000 as well as the long cage of a Sram WifliNarrow wide tooth profile benefits include reduced articulation in the chain while retaining accurate shiftingMay require use of a longer chainShimano OS Hybrid CeramicBlack/BlueUPC/EAN/GTIN: 735201956022