These heavy-duty casters are made of high-quality steel, nylon, and zinc materials, with a load-bearing capacity of up to 1250 lbs. They are designed to withstand tough conditions both indoors and outdoors, with strong abrasion resistance and shock absorption capabilities. The casters swivel smoothly and quietly with strong roller bearings and a steel spanner bushing, making them suitable for handling heavy loads. Their brake and rigid design make them flexible and an indispensable item in any home.