Features:Fans provide more dynamic control of the intake systemBy forcing a powerful airflow into the combustion chamber at high speed.Once the engine is started, the propeller rotates to create maximum turbulence in the incoming airflow.Allows for enhanced fuel atomization in the combustion chamber, resulting in a significant increase in horsepower and a better gas/fuel millage.With simple installation steps, you can enjoy faster and better speed while saving on gasoline Simultaneously!Specification:Single Side : Length 50mm , Have One Fan bladeDouble Side : Length 75mm , Have Two Fan bladesDiameter: 64mm / 2.519 inchesMaterial: Aluminum AlloyColor: BluePackage :1 * Car Turbine Supercharger