Features 1、Chrome Molybdenum Steel Material: The 7 speed flywheel is made of chrome molybdenum steel, which has high strength and wear resistance. 2、Corrosion and Rust Prevention: High tension back plate, with 3 layers of nickel chromium plating on the surface, anti corrosion and rust prevention. 3、Scope of Application: 7 speed 11‑30T freewheel is only applicable to the refitting of the external 7 speed cassette flywheel by the folding bicycle. 4、Hollow Out Lightweight Design: The mud discharge hole can reduce the weight and prevent mud from accumulating, making it easier to clean. 5、Smooth Operation: This freewheel characterized by smooth rotation without much noise, high accuracy internal thread, ensure close connection with bike hub. Item Type: 7 Speed Flywheel Product Material: Chrome Molybdenum Steel Product Style: 7 Speed 11-30T Product Color: Silver Weight: Approx. 280g / 9.9oz Package List 1 x Bike Flywheel 3 x Accessories