Material: Fork: Stainless steel.Tread: Polyurethane 98 +/-4° Shore A.Wheel body: Plastic, screwed.Wheel bearing: Plain bearing.Swivel bearing: Double ball ring.For interior and exterior use. Non-marking and abrasion resistant. Good resistance to oil, grease, petrol and chemicals.Temperature range: -20°C to +70°C.* Width of the castor