Features： 1、Finger derailleur, 13 speed 1:1 technology improves accuracy and response speed, all aluminum lever, coated stainless steel wire (length 2050mm). 2、Rear derailleur, 13 speed extended leg direct mounted rear derailleur, shadow rear derailleur design, enlarged bearing guide wheel, maximum compatibility with 52T flywheel. 3、Our bicycle 13 speed transmission adopts ergonomic design, simple design, easy to install and disassemble, and convenient to use. 4、This mountain bike transmission is made of aluminum alloy, which is durable, hard to damage, and has a long service life. 5、Our product set includes finger and rear derailleur, suitable for mountain bike, road bikes, variable speed bicycle, etc. Specification： Item Type: Bike Derailleur Material: Aluminum Alloy Finger Derailleur: 13 speeds 1:1 technology to improve accuracy and response speed, all aluminum lever, coated stainless steel wire (length 2050mm) Rear Derailleur: 13 speeds extended leg straight mounted rear derailleur, shadow rear derailleur design, enlarged bearing guide wheel, maximum compatibility with 52T flywheel Configuration: Finger Derailleur, Rear Derailleur Package List： 1 x Finger Derailleur 1 x Rear Derailleur