... 2. Beautiful apperance 3. Low weight, etc. 4. Easy assemble The colour steel polystyrene sandwich board is good at thermal insulation and low ... 1,150mm Upper and lower layer: uses color steel plate Thickness of the color steel plate: 0.3 to 0.6mm Middle: polystyrene ... Color: white, green, blue, red, etc. The products has good at warm keeping, and it is in low price Colour Steel Sandwich Board