Feature:1. Shifter Lever Performance: Adopting 12 speed 1:1 technology, the shifter has been improved the accuracy and response speed.2. Shifter Lever Material: All aluminum shifter lever and coated stainless steel shifter lever cable (2050mm / 80.7in in length) for good performance of the shifter.3. Rear Derailleur Performance: 12 speed carbon fiber guide plate rear derailleur adopts shadow rear derailleur design.4. Enlarged Bearing Guide Wheel: Enlarged bearing guide wheel of the rear derailleur can be compatible with 52T flywheel at most.5. Flywheel Material: The flywheel is made of high tensile steel plate through quenching process and tempered hardening treatment.Specification:Item Type: 12 Speed GroupsetProduct Color: As Pictures Shown Shifter Lever Cable Length: Approx. 2050mm / 80.7inProduct Weight: Approx. 1908g / 67.3ozFlywheel: 12 Speed Mountain Bike Cassette FlywheelMaterial: High Tensile Steel Plate + Aluminum FrameNumber of Teeth: 11T-50TGear Ratio: 11-13-15-17-19-21-24-28-32-36-42-50TDerailleur: 12 Speed Derailleur for Mountain BikesMaterial: Aluminum Alloy + Carbon FiberShifter Lever: 12 speed 1:1 technology to improve accuracy and response speed, all aluminum shifter lever and coated stainless steel shifter lever cable.Rear Derailleur: 12 speed carbon fiber guide plate rear derailleur, shadow rear derailleur design, enlarged bearing guide wheel, compatible with 52T flywheel at most.Configuration: A Set with Shifter Lever + Rear DerailleurChain: 12 Speed ChainSpecification: 1/2 Inch 11/128 InchPackage List:1 x Cassette Flywheel2 x Chain Ring1 x Cassette Flywheel Cover 1 x Shifter Lever1 x Rear Derailleur1 x Chain2 x Chain LinkNote:After the installation is complete, check whether the flywheel is locked and whether it is aligned.