1.Chemical etching, 2.Low cost, 3.Various apertures, 4.shapes and bar combinations, 5.Various surface finishes available. 1.Heating film is a new-style flake rensistance which is used for heating or keeping warm for other things. 2.Interior Meterial: stainless steel, aludirome, copper foil etc. 3.Thickness of the interior metal: 0.01~0.2mm 4.Meterial of the insulation cover: PET film, PI film, ...