?FLEXIBLE PVC DUCTING?- Applied hard-wearing, flexible vinyl woven polyester with carbon wire spring and adhesive tape, smooth inside wall. Designed to be super flexible and flame-retardant. ?ROPES ADJUSTABLE?- Thick ropes can be adjusted to fit the duct' mouth size, ensuring a good-sealing environment and high woking efficiency. ?D-SHAPED RINGS?- D-shaped rings are set for hanging the ducting freely. Two stainless steel rings plus 4 D-shaped rings of two meters for one ring. ?REINFORCED DESIGN?- Wear resistant professional industrial adhesive tape and thickened high carbon wire spring ensure rings to be practical and durable. ?WIDE APPLICATION?- Our heavy duty 10 inch duct designed for ventilation applications includingduct fans and vent exhausts in factories, basements, farms, chemical, tunnel, automobile manufacturing, ect.