Offering twin-wall hollow polycarbonate sheet with following specification: 1) Thickness: 4mm, 4. 5mm, 5mm, 6mm, 8mm, 10mm, 12mm. 2) Standard width and length: 2100 x 6000mm. 3) Color: clear, blue, lake-blue, green, brown, grey, opal-white, red, etc. 4) Light weight and high impact strength. 5) Fire retardency. 6) Good Light transmission.