Feature: Fireproof Bubble Diameter and Height: 4mm*10mm, 7mm*20mm, 8mm*25mm. Size/Roll Normal Size: 1.2m*40m. Max Width Is 1.58m, Length Can Be Custo Reflectivity: 96%-97% Water Vapor Transmission: 0.013G2kpa Tensile Strength (Md): 16.98mpa