Features 1、Multi Layer Plating and Anti Rust Treatment: High tension steel plate nickel chromium plating, multi layer plating and anti rust treatment, high accuracy tooth ratio. 2、Concave Tooth Design: Concave tooth design, make the speed change more gliding, weight reduction, and strong compatibility. Suitable for road bikes. 3、Hollow Technology: Hollow technology, can effectively and easily reduce the weight, so that riding easier, and more gliding. 4、Runs Smoothly: The flywheel rotates smoothly and has no noise, and can well ensure that it is closely connected with the wheel hub of the bicycle and runs smoothly. 5、Simple Operation: Simple to operate, easy to use, easy to install and disassemble. Without any difficult requirements even though you use it for the first time. Item Type: Bicycle Freewheel Weight: Approx.386g / 13.6oz Speed Ratio: 11 Speed 11-12-13-14-15-17-19-21-23-25-30T Material: Nickel Chrome Steel Applicability: Suitable For Road Bikes Package List 1 x Flywheel 2 x Tooth Slice 1 x Flywheel Cover