ProGear Tech Performance H4 Bi-Xenon HID kit is the best choice for consumers when comparing quality & pricing. It features countless protective measures and technologies derived from the most popular OEM benchmarks. 15 mm Die-cast aluminum body can fit most anywhere under the hood. Silicon potted circuit board; eliminating any chance of moisture damage. "A grade" Quartz ArcTM UV-StopTM burner with thermal base capsule provides perfect alignment which is even more important than anything else when it comes to projection angle of lights. Nevertheless, the quartz sealed electrode from Germany help keep the bulbs running brighter for longer, provides strong aging resistance than other HID bulb. Installation is a simply, with the universal AMP-stylish Plug and Play connectors and follow installation guide included in every box and you'll understand how easy our Plug and Play technology works. The kit is designed to run for at least 50000 hours and there's not much that will stand in their way.