The function of front sway bar links is to balance the car, enhance the car's control and prevent the car roll. So it is an important part of car. This 2pcs Stabilizer Sway Bar Links for Gmc Envoy 2002-2009 1 Year Warranty is highly recommended to you. It's made of high and new quality, and it designed with solid steel material and fine workmanship, which is sturdy and durable. And this kit can be used for a long time. Besides that, you can use and install it without instruction.