Twin-wall polycarbonate sheet(2 layers) 1)U.V Treatment:1 side 2)Thickness:6mm(can be made 4mm,5mm,8mm,10mm) 3) color:vailable:clear,red,white,opal,bronze,green,grass-green,blue,lake-blue) Standard size:2.1m(W)*6.0M(L),2.1m(W)*12.0m(L), 1.83m(W)*6.0m(L). The size can be customized