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: The unique design of the rollers reduces friction and noise, resulting in a smoother and quieter driving experience; Materials: The hinges are made of metal, a compact and lightweight structure, and fine workmanship; Installation: Engineering-designed for direct installation, requiring no modifications or additional adapters; 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