Wheel material: Black rubber tread + plastic wheel core, Black Rubber Flat Bottom Fixed Casters with excellent elasticity and wear resistance, good aging resistance, excellent low temperature resistance, low heat generation under dynamic load, Caster Wheel Threaded Stem suitable for electrical equipment industry, trolley industry, garbage Use when the car is suitable for high loads. Hardness of tread: 85(±5) Shore A Temperature: - 40 / + 80 °C Wheel Dia: 160mm, 180mm Caster Wheel Tube Inserts Load capacity: 160-200kg Flat bottom fixed caster, pressed rigid wheel frame, bearing plastci roller bearing Wheel Material: Black rubber with PP core Housing made of pressed steel, Zinc plating Housing: Fixed caster