This black PU wheel has a wheel diameter of 50mm and a socket diameter of 26mm. It is made of PP+PVC materials and combines multiple advantages. The PP material endows the casters with lightweight and impact-resistant characteristics, making it easy and flexible to move and durable; the PVC material enhances wear resistance and chemical corrosion resistance, adapts to complex environments, and extends the service life. The black PU wheel surface design is simple and elegant, rolling smoothly and with low noise, ensuring a quiet and comfortable mobile experience. It is suitable for a variety of office chair devices. With high-quality materials and fine craftsmanship, it meets the multiple needs of durability, functionality ,and aesthetics, and is an excellent choice for improving the mobility of equipment.