... , with Air channel, more than 3 years weatherability, 21kg/Roll, 1.52m*30m/Roll(2) Polymeric: Imported 0.25mm film from Europe ... , more than 5 years weatherability, 22kg/Roll for 1.52m*30m/Roll, 28kg/Roll for 1.52m*50m/Roll.Advantages: Automatic recovery, friction resisting, no ...