The scicon rear derailleur protector has been designed to provide shelter for the lower rear end of your bikes frame double padded walls with integrated plastic reinforcement and a special rigid shield protects the rear derailleur and dropouts from hard knocks and shocks key features protects the lower rear end of your bike frame double padded walls for protection material nylon 210 hdf plastic fastening elastic velcro straps weight 192g dimensions 22 x 25 x 17cm