Pplication : As suction and transport hose especially ideal for solids such as dust, powders, wood chips, granulates and ect. Also are suitable for ventilation and air conditioning system, industrial vacuum cleaner Features: Extremely flexible and compressible Extremely abrasion-resistant Tearing resistant Very transparent wall Sizes ranges from 1 to 12 are all available Wall thickness ranges from 0.4mm to 1.2mm are available Different colors are optional Working temperature range: -40 to +90 degree Material: Wall: top grade of polyurethane Spiral: copper coated steel wire Each roll into one plastic bag Every 3-4 rolls into one big woven bag outside.