Our Duct hose has a specially compounded rigid PVC reinforcement which is helically wound and inseparably fused to the soft inner walls. By its unique construction, ducting results in a thin, very smooth wall, being almost completely protected from any possible crushing.Light weight & flexible : The perfect reinforcement of rigid PVC with soft PVC gives it both, strength and flexibility. It is tough, light so easy to carry and handle thus increases working efficiency.