Description: Material: Made of high quality ABS and silicone, non-slip, wear-resistant, comfortable to touch, durable to use, it will not cause any damage to your steering wheel. Purpose: 360 power boosters knob makes you easier to reverse and control the steering wheel, ensures safe driving and ease single hand driving. Advantages: Making your long-distance driving labor saving, more relax, the steering wheel is no longer heavy. Easy to Install: Unscrew the screw at the lower end of the bayonet, then clip the upper and lower parts of the bayonet to the steering wheel, and then tighten the screws. Universal: Suitable for all types of vehicles' steering wheels, 3 colors for you to choose. Specification: Material: ABS, silicone Type: Steering wheel booster ball Weight: 90g Model: ST-313 Installation Location: Car steering wheel Use range: all types of vehicles Size Chart: 13x10cm/5.12x3.94inch Package Includes: 1 Piece Car Booster Ball Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!