Twin-wall hollow polycarbonate sheet 1) Thickness: 4mm.4.5mm,5mm,6mm ... 6000mm TRIPLE layer hollow pc sheetTwin-wall hollow polycarbonate sheet(4.28 0651) Thickness: 4mm.4.5mm,5mm ... 2100 x 6000mm3) Color: clear,blue,lake-blue,green,brown,grey,opal-white,red,etc4) Light weight, High ... bus-stops, shopping arcades, large stadium and raintents, green-house, swimming covering, roof light or canopy for office ...