18-21 BYD Tang second generation (3D fully surrounded and thickened plastic steel plate) 18-21 BYD Tang Second Generation(3D fully surrounded and thickened manganese steel plate) 18-21 BYD Tang Second generation (3D fully surrounded and thickened manganese steel plate) 18-21 BYD Tang Second generation (3D fully surrounded and thickened manganese steel plate) 18-21 BYD Tang Second generation (3D fully surrounded and thickened