One key start button decorative ring material and finish: The ring is made of zinc alloy and polymer clay for strength and long term use. The surface is inlaid with many sparkling crystal rhinestones, delivering a bright, beautiful look that enhances your car's appearance and adds a touch of noble style. Practical function and protection: The sparkling decorative ring is fashionable and exquisite, decorating the engine start/stop button to look more dazzling and attractive. It beautifies your start/stop button while helping protect the button from scratches and shielding the car's internal components. Wide application and compatibility: Inner diameter 1.2 inches and outer diameter 1.5 inches. Easy to adhere to engine start/stop buttons on different vehicles for a secure fit. Also suitable for automotive air conditioning knobs, radio switches, and shift levers, providing a stylish interior upgrade. Simple installation: The rings are designed to fit on the engine start/stop button. Easy to install: each ring has an adhesive backing. Clean the button first, peel off the tape, and press firmly against the button. It stays in place and does not easily come off. The back includes a adhesive backing; peel the protective layer and stick it on for a secure, lasting hold. Use scenarios and applications: Upgrading the interior look of a sedan or SUV by adding a crystal ring to the engine start/stop button. car interior controls by applying the ring to air conditioning knobs or radio switches. Enhancing and protecting the start button area in sports cars or daily drivers while reflecting your style.