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Features: 1.Premium Quality : Made of high quality compound material, tough, sturdy, high strength and durable. 2.Great Appearance : Using attractive design style, cool and beautiful, with simple and elegant elements, offer you great using experience. 3.Easy to Install : Adopt ergonomic design, with simple design, easy to install and remove, convenient to use. 4.Applicable Occasion : Compatible with 7 Speed 21 Speed, suitable for mountain bikes and road bikes. Specifications: Material:High quality metal Size:14*7*6cm Weight:310g Package includes: one transmission*1