PREMIUM QUALITY- The set of caster wheels, constructed of the popular non-marking polyurethane material and cast iron core, is wear-resistant and reduce pretty much noise. Especially with the steel frame, it ensures durability and longevity. 3200LBS LOADING CAPACITY- Heavy-duty quality non-welding carbon steel for ensuring stability and high strength bearing capacity, each castor wheel can bear 800lbs, these four castor wheels can support a load up to 3200 lbs in total. FLEXIBLE & QUIET- Swivel casters rotate 360 degrees, which makes turning the mating equipment possible. Easy to transform to any directions as you need, and spend little strength to move on. You can enjoy a smooth and quiet operation.