Features1Aluminum Alloy: The bike freewheel is made of aluminum alloy, ensuring rust resistance and durability. It is built to last and withstand various riding conditions. 2Smooth and Noiseless Rotation: The freewheel offers smooth and noise free rotation, the precise engineering ensures a seamless ride without any unwanted sounds or vibrations. 3Highly Precise Internal Thread: The freewheel is equipped with highly precise internal threading, ensuring a tight and secure connection with the bike wheel hub. This provides stability and reliability during rides. 4Hollow Design: The freewheel features a hollow design that effectively reduces weight without compromising strength. It strikes a balance between strength and weight, lightening the load on your bike and optimizing performance. 5Easy Installation: The bike cassette is designed for easy installation and user friendly operation. It is an ideal choice for outdoor cycling enthusiasts and riders of all levels.SpecificationItem Type: Bike FreewheelMaterial: Aluminum alloyWeight: Approx. 406g/14.3ozPackage List1 xBike Freewheel2 xGear Plate