OEM E221510H3 Xenon HID Headlight Ballast with Igniter E221-51-0H3 For Mercedes For Benz. Material: The headlight ballast control unit module is made of aluminum, which is wear-resistant, durable, and not easily damaged, offering high cost-effectiveness. Main Functions: Made of durable aluminum alloy, this headlight module ballast enhances the brightness and beam distance of headlights, improving nighttime driving safety. Installation: This ballast retrofit kit is easy to install and perfectly compatible with your vehicle. No complicated operations or modifications are required; it is simple to use, saving time and effort. Customer Service: Please ensure the part number of your car ballast matches the part number you are replacing. If you are unsure, please feel free to leave us a message., Manufacturer: HNHLSM