The steering wheel assist ball of the car is made of high-quality metal alloy, ABS, and rubber materials, with a structure that is durable for many years, anti slip, and noise free. The power ball can rotate 360 degrees, making it easy to operate, making driving flexible and comfortable, and improving the driving experience. The steering wheel knob will provide urgently needed support for safe, convenient, and effective control of the car's steering wheel. Easy to install, simply clip the ring in place on the steering wheel and tighten the bolt with a washer to securely secure the ring. The booster ball is compatible with most vehicles. If you have any questions, please contact us promptly and we will reply promptly. Thank you. Package includes: 1 * Automotive steering wheel assist ball Attention: 1. Due to manual measurement, please allow for minor errors. Please ensure that you do not mind before bidding. 2. Colors may vary depending on the monitor, please understand. Hello, please pay attention to your shipping address when purchasing products. If your delivery information (such as name, street, house number, doorbell/email without a name, etc.) is incorrect, the order will not be delivered correctly