Features1Made of highquality aluminum alloy + iron, it has higher wear resistance, high strength, rust resistance and no deformation. 2The flywheel can ensure the smoothly rotation of the chain, and the hollow design reduces the weight and pressure of longterm driving. 3Specially designed for 10/11 speed bicycles, suitable for chain links between 1146T, easy to install and use. 4Mud discharge hole design is convenient for water drainage and sand discharge, smoothly speed change. 5Good compatibility, ultralight weight, largest piece 7075 integrated CNC, high performance.SpecificationItem Type: Split Structure CassetteMaterial: Aluminum Alloy+IronColor: SilverPackage List1 xSplit LargeFlywheel1 xSplit Medium Flywheel4 x GearRing1 x LockRing1 x Bracket Sleeve1 x IronRing