... 4mm,5mm,6mm,7.5mm,8mm,10mm,12mm,14mm,16mm,18mm.Also with twin-wall and triple-wall in 12mm,14mm ... ,16mm,18mm.4)Color:clear,lake blue,blue,grass green,opal,grey ... overhead highways.8)For agri culture greenhouses and sheds. 4mm-18mm polycarbonate roofing sheet