Features: The bicycle rear derailleur hanger is made of aluminum alloy material, it is durable, firm, sturdy and corrosion resistance.Easy to install, suitable for most mountain bike, road bike and so on.We will ship from real UK warehouses, fast and efficient shopping experience, as well as brand quality assurance for you. Description: Brand: Bolany Item: Extension hanger Color: black,red,blue,silver,green,purple Weight: 11.9g,approx Material:aluminum alloy Process: CNC precision machining with aluminum alloy anode color screw Fit: 8-12 speed Cassette,the maximum can be 50T Cassette Quantity: 1PC.