Swivel, Quiet-Roll Shock-Absorbing Plate Caster, Load Rating 165 lb, Swivel Lock Type No Lock Included, Wheel Dia. 4 in, Wheel Width 1 1/4 in, Wheel/Tread Material Polyurethane, Wheel Core Material Aluminum, Non-Marking Yes, Number of Wheels 1, Caster Brake Type Face Contact Brake, Tread Shape Donut