H4 HID Conversion Kits as also know as 9003 HID Kit. These are dual filament bulbs that provide light from your low beams and high beams from the same bulb. Additionally, multiple ballast upgrades are available for you to choose from Digital to 55-watt ballasts. Added functionality components such as relays and cancellers are strongly recommended to be purchased with your H4 HID Kit. Visit our website to buy now!