Feature●Wide application: The bicycle jockey wheel fits almost all 11T mountain bikes, and supports a variety of speed shifts. Better cycling experience. Necessary accessories for bikes●【PERFECT DESIGN】These pulleys work on smooth ball bearings and are a necessary accessory for your bike. 4 different colors to meet your different needs, black + red cap, red, golden and silver for you to choose. Enjoy your cycling●Aluminum alloy: The bicycle wheel derailleur is made of aluminum alloy and material that is lightweight, durable, and rust resistant, and has been anodized, and it can last a lifetime. This product is very durable●Easy Installation: The bicycle derailleur guide pulley is easy to install. No complicated tools required. No complicated work required. Save your time and energy. Simple design and large function, ready to use●【Standard Specifications】Compliant with strict quality control standards, reliable to use. Manufactured to Original Specifications Built to meet standard specifications and strictly follow factory quality controlDescription