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 elliptical trainer (txj-l012) Si capacity:2000 pcs/month Function: developing the whole body joints, strengthening cardiac and pneumonic function, and shaping figure. Direction: putt your feet on the pedals, holding the handles with your both hands and moving your hands and feet alternately.