describe:The gears are flexible, the gear shifting is smooth, and the indicators are accurate.This bicycle shift derailleur is made of sturdy metal with a lightweight and all-in-one design for easy control.Bicycle shifting is quick to install and remove.This bicycle derailleur is of stable quality and is perfectly compatible with speed control systems.Value for money isPretty good, bike shifting is a good option for a carThe pursuit of cost-effective friends.Specification:Name: Bicycle DerailleurMaterial: ABSColour: BlackModel: M4000Level: 9-speed/27-speedAttribute: Mountain bike shifterpacking listOption 1: 1*3 speed left, 9 speed rightOption 2: 1*Right 9-speedOption 3: 1*left and right pairNotice:- The size error of manual measurement may be small.- Color deviation may vary due to different monitor settings, please understand.packing listOption 1: 1*3 speed left, 9 speed rightOption 2: 1*Right 9-speedOption 3: 1*left and right pair