... sanwich type, with Polyurethane foam, and with its Pinch resistant panel structure, and other safety components, you can be assured ... paneld, Unique structure of panels: separate steel sheet inside the panel at the hinges' installing position, to make the installing of ... , all adopts galvanized steel plate, and the thinkness of the panel, after filling in the horniness polyurethane foam( no Freon ), ...