Features1Shifter: Adopting 12 speed 1:1 technology, the shifter has been improved the accuracy and response speed. 2Details: All aluminum shifter lever and coated stainless steel shifter lever cable (2050mm / 80.7in in length) for good performance of the shifter. 3Rear Derailleur: 12 speed carbon fiber guide plate rear derailleur adopts shadow rear derailleur design. 4Compatible Flywheel: Enlarged bearing guide wheel of the rear derailleur can be compatible with 52T flywheel at most. 5Easy to Install and Remove: The 12 speed shifter and rear derailleur set adopts ergonomic design, easy to install and disassemble, and convenient to use.SpecificationItem Type: 12 Speed Derailleur GroupsetMaterial: Aluminum Alloy + Carbon FiberProduct Color: As Pictures Shown Shifter Lever Cable Length: Approx. 2050mm / 80.7inProduct Weight: Approx. 589g / 20.8ozPackage List1 xShifterLever1 xRearDerailleur