- Crafted for a lightweight yet robust performance, these maintenance-free 5 inch casters wheels boast a high strength-to-weight ratio. The sturdy metallic look of the aluminum wheel core may even offer aesthetic appeal over traditional cast-iron cores, providing flexibility for various industrial and ergonomic applications. - The abrasion-resistant, oil-resistant, and chemical-resistant polyurethane wheels make these 5 inch heavy duty castors wheels suitable for a wide range of environments, including research laboratories, hospitals, bakeries, and numerous industrial manufacturing facilities. The top casters wheels feature double ball raceways for added load capacity and durability make the casters low frictional resistance and high speed limit, easier to move.