Features: Make of aluminum alloy body and nylons guide wheel, ensuring performances even in demanding Cycling conditions. Easy to install and disassemble. Suitable for 5/6/7 speed folding bikes, this rear derailleur is fully applicable to two hole frame, as well as single hole frame with a converter. Equipped with a nylons fiber guide wheel, this rear derailleur effectively reduces frictions noise during chain engagement, ensuring a smooth and quieter ride. Suitable for 11-28T Flywheels, this rear derailleur allows for gear option, providing a suitable setups for various terrains and Cycling preferences. Suitable for mountain bike, road bikes, variable speed bicycles, folding and city bikes. Specifications: Materials: Aluminum alloy and nylons Color: Black/Black Redness/Silver Size: As shown in the picture Package Includes: 1pc Bike Rear Derailleur note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.