Material: H-ID headlight stabilizer is made of metal + ABS, which is wear-resistant and high-temperature resistant, providing you with quality assurance, so you can rest assured to buy and use our products. Function: H-ID ballast adjusts the voltage and current supplied to the lamp, providing short circuit protection, open circuit protection, polarity protection, overload protection and overcharge protection. Installation: These ballast units can be installed directly without any recoding/programming, and can be installed on the left and right sides. Quality: Made of materials that meet strict OEM requirements, this product offers stable performance and is an ideal replacement option. Note: To ensure you receive the correct item, please confirm that your OEM number matches the one in the description.