Feature: 1. Shifter: Adopting 12 speed 1:1 technology, the shifter has been improved the accuracy and response speed. 2. Details: 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: 12 speed carbon fiber guide plate rear derailleur adopts shadow rear derailleur design. 4. Compatible Flywheel: Enlarged bearing guide wheel of the rear derailleur can be compatible with 52T flywheel at most. 5. Cassette Flywheel: The flywheel is made of high tensile steel plate through quenching process and tempered hardening treatment. With multi layer electroplating treatment, the cassette is anti rust. Loss teeth design makes gear shifting smoother. Specification: Item Type: 12 Speed Groupset Product Color: As Pictures Shown Shifter Lever Cable Length: Approx. 2050mm / 80.7in Product Weight: Approx. 1866g / 65.8oz Flywheel: 12 Speed Mountain Bike Cassette Flywheel Material: High Tensile Steel Plate + Aluminum Frame Number of Teeth: 11T-46T Gear Ratio: 11-13-15-17-19-21-24-28-32-36-40-46T Derailleur: 12 Speed Derailleur for Mountain Bikes Material: Aluminum Alloy Shifter 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.. Package List: 1 x Cassette Flywheel1 x Shifter Lever1 x Rear Derailleur1 x Chain2 x Chain Link