Features1Good Performance: The rear indexing transmission system components, such as the indexing mechanism built into the gear lever, SIS frictionless rear indexing shift cable and soft operated rear derailleur, constitute indexing system. 2Unique Design Sprocket: The unique design of the sprockets, combined with tooth profile and shift ramps, is designed to improve chain control during shifting. The result is fast and sensitive index changes. 36 Speed 7 Speed: TY300 Rear derailleur 6/7 speeds are compatible with derailleur equipped with 6 and 7 speed SIS index derailleur. 4 Fit: Bike rear derailleur closely fits the original machine hole position with accurate shape and size, having less stuck situations during use. 5Good Workmanship: Bicycle rear derailleur with exquisite workmanship, beautiful appearance design, providing you great using experience.SpecificationItem Type:Mountain Bike TransmissionProduct Material: IronProduct Color: BlackWeight: Approx. 500g / 17.6ozPackage List1 x Mountain Bike Transmission