... aluminum 2.More wearable 3.Not easy to rust. 4..Super appearance Remark:1. Fine appearance, free of burrs, ... finegood heat dissipation.2. Cylinder are made of choiced boron alloy cast iron with excellent wear resistance and good metallograhic structure ... Switch, Key set, CDI unit, Ignition Coil, Rectifierscooter8. Timing Chain, Valves Intake and Outtake, Camshaft9.Cylinder Head10. Brake Shoes11. Wheel ...