Compatibility: for Audi A4 S4 A5 S5 Q5 SQ5 2017 2018 2020 2021 2023 2024 Air conditioning knob decorative ring accessories.  Design: Made according to the size of the original car knob, perfectly fitting.  Material: Aluminum alloy+high-quality rhinestones.  Improve appearance: Water diamonds refract different colors of light under sunlight/lighting, making your car air conditioning knob look beautiful and unique.  Installation: The knob comes with 3M tape and can be installed by covering it with adhesive without damaging the original knob.