Features1Aluminum Alloy Material: 8 speed cassette is made of aluminum alloy, which is suitable for various harsh riding environments. Anticorrosion, good heat resistance, and long service life. 2Smooth Rotation and Noiseless: Bicycle freewheel provides smooth rotation and operates quietly, enhancing the overall riding experience. 3Accurate Internal Thread: The high accuracy internal thread ensures a tight connection with the bicycle hub, improving stability and power transfer. 4Hollow Design: The hollow design helps to reduce weight and alleviate the burden during cycling. It achieves a good balance between strength and weight, making it easy to install and use. 5Easy Installation: Bike cassette is designed for convenient installation, making it easy for users to replace or upgrade their existing bike freewheel.SpecificationItem Type: 8 Speed CassetteMaterial: Aluminum AlloyWeight: Approx. 542g / 19.1ozPackage List1 x 8 Speed Cassette2 x Sprockets