Product name: steering wheel power ball Material: metal Product features: 1: assist the driver to reduce the strength of the steering wheel, driving more handy. 2: generally driving a corner is always hard to turn, if installed a steering wheel booster, not only easy to turn, for the long-term driving is an indispensable auxiliary tool. 3: this product is made by metal coating and baking paint technology, which is not easy to fade, and has a high metal tone with a high texture, which can show a unique avant-garde personality. 4: this product is elaborately designed to give the owner more easy and convenient control and normal driving when making a large turn. 5: this product has two sizes, two rubber pads, the large size of the inner circumference of 13cm, the small size of 11cm, the length of rubber pad 7.8cm. 6: this product is a universal design, easy to install and use; Workmanship and design are first-class, is absolutely a good helper driving. A Installed the booster balls in this area will be more suitable for most people.And just a little strength can easily turn the steering wheel. B If you need to install a second power ball, it is recommended to install the B position. The use of the location will be more smoothly. C This position is more suitable for people with long arm.The installation according to the personal using custom. D The area is generally not recommended to install,and will be difficult to use. In general, the size of the steering wheel is about 10CM to 11CM (less than 10CM steering wheel can pad two pieces of Rubber pad), you can use a small button,