Features1Hollow Out Design: The 8 speed 1442T flywheel adopts hollow out design, which can easily reduce weight and reduce cycling burden, achieving a good balance between strength and weight. 2Aluminum Alloy Material: The 8 speed 1442T flywheel is made of aluminum alloy, which is not easy to rust and is durable. 3Smooth Rotation and No Noise: The 8 speed 1442T cassette freewheel rotates smoothly without noise, great using experience. 4Accurate Internal Threads: High accuracy internal threads ot the 8 speed cassette ensure a tight connection with the bike hub. 5Easy To Install: Bike freewheel is easy to install, you can directly replace the old or damaged freewheel to obtain higher strength.SpecificationItem Type: Bike Cassette FlywheelProduct Material:AluminumAlloyWeight: Approx. 577g / 20.4ozPackage List1 x Flywheel2 x Tooth Plate