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