The main frame is processed from 51.4*26 elliptical pipes and has a beautiful shape. The wall thickness is 1.3mm. It has the characteristics of high strength and light weight. The surface is sprayed and has anti-aging/oxidation characteristics. The foldable frame is easy to carry and saves space. Seat cushion/back cushion (adjustable): The overall tensile strength of the seat cushion is up to 5000N). The front non-inflatable wear-resistant 8-inch EVA tire has ultra-light characteristics. The universal front wheel is equipped with aluminum alloy front wheel forks; the rear non-inflatable wear-resistant 8-inch EVA tire.