"The Titan Heavy-Duty Solid Poly Caster offers an easy way to move objects and heavy loads. Capacity lbs. 500, Material Type Polyurethane, Casters qty. 1, Foot Brake No, Wheel Type Polyurethane, Caster Type Rigid, Wheel Diameter in. 5. 5 in. dia. 500-lb. capacity Ideal for use on concrete Chemical-resistant construction"