The disc is made with ecological board, unique shape, elegant radian, polished smooth corner flashing the unique light of the ecological board.  High quality fine iron, strong bearing force, not easy to deformation, high hardness, full welding points.  Transition natural long service life.  The surface of the plate is smooth, because the double-sided expansion coefficient of the plate is the same, it is not easy to be deformed, the color is bright, and the surface is wear-resistant and corrosion-resistant.