About this item:AIR DUCTING SIZE: 4 inches (100mm diameter) x 16 feet (5m extented length), Steel wire space (20mm)PVC VENT HOSE:Black PVC Film,Lightproof and Waterproof,And Also Reducing Noise from Fans and Carbon Filter Systems.Compared to Traditional Aluminum Foil Hoses, PVC Dryer Vent Hose Are Stronger, Less Prone to Tearing and Have a Long Service Life.EASY TO USE: Aluminum Ducting Can Be Easily Cut By Wire Cutter and Paper Knife(Caution, Risk Of Scratching Hand). The package include 2pcs 4inches stainless steel Hose Clamps to fix it well. This Ducting Suitable for Kitchens,Bathroom,Grow Tent,Green Houses and Air Conditioner Etc.FLEXIBLE AIR DUCT: This vent duct can be bent at well. We Specialize in Flexible Hose for Heating, Cooling, and Venting in Out.