The middle door pulley bracket is made of metal, which is stable and durable; the roller part is made of high-strength engineering plastic, which has good wear resistance and stability. Features: Our car sliding door rollers utilize advanced weight distribution technology to evenly support the weight of the sliding door; Material: The hinges are made of metal, a compact and lightweight structure, and fine workmanship; Easy Installation: These car door hinges are designed for easy installation, conform to standard specifications, and allow for quick and simple replacement; It helps to alleviate the jamming, abnormal noise or shaking of the sliding door during use and improve the operation of the door body., Manufacturer: PENGNAQP