Pair of Black Glossy Rear Window Side Car Wing Replacement for Mercedes Benz GLK Class X204 2009-20151. Perfect Fit: The high-end rear spoiler on the window side is a special replacement for Mercedes Benz GLK Class X204 2009-2015, perfectly matches the original.2. Powerful Function: The window-side rear sash can reduce drag to improve stable control when driving at high speed and effectively increase fuel consumption.3. Aerodynamic part: the rear side of the canard window can exert downward force, and also improve the rear tire's traction by using the airflow through the body when driving.4. High-Quality ABS: The rear window side spoiler is carefully made of advanced ABS plastics, which have excellent resistance to bad weather, durable to use.5. Exquisite Appearance: The exquisite finish of the rear window wings is designed with black glossy appearance, distinctive and eye-catching