... for industrial carts ,hotels,foodservic casterItem NO:31307 systemsmaterial: PU Wheel , PP coreBearing:Ball bearing,and bushing, or Delrin BearingHardness:90A, 75ADiameter ... :medical apppliance equipment, Tool appliance cart,and Hotel handcart.Especially suited for use in hospital , hotels and food services universe, swivel ,medical caster ...