Workmanship specification: Produced under iso 9001 quality management system, conform to tuv-gs din 79000 standard. Materials:high quality steel and hot galvanized steel is optional. Main pipe thickness is 3.00mm, supporting part is 2.75mm. Sand blasting machine to clean the rust before coating. Powder coating:electrostatic coating, lacquer that bake treatment. First layer epoxy powder(50-80um), second layer plastic powder(90-140um). Welding technique:arc-welding, cabon-dioxide welding, mixed-gas welding. Stainless screws and nuts. Bearings are from nsk. Product name:outdoor fitness with tuv gs---double-unites rambler (txj-l034) Size ty of lower limbs, and enhancing the flexibility of the hip joint. Direction: hold crossbeam with hands, stand on the pedal and swing legs back and forth just like walking.