This XPOWER ducting hose is a rugged PVC vinyl-coated polyester fabric hose with a black external PVC strip which resists exterior damage when dragging. This hose features an 8, 12, or 16 inch. diameter and an integrated spring steel wire support coil which is flexible for expansion, compression, and angled turns. Great for heating, air conditioning, dehumidification, blower, ventilation, and exhaust jobs in a variety of industrial, residential, and construction applications.