... board, back board are steel plate.2 FeaturesIt gathers Insulation, heat insulation, bearing, waterproof up, and has rich colors, beautiful ... to assemble and disassemble and the short production per Insulation board1 MaterialWall panel sandwich board is made up ... board, back board are steel plate.2 FeaturesIt gathers Insulation, heat insulation, bearing, waterproof up, and has rich colors, beautiful ...