aluminum spiral hose 1.Materials: Aluminum foil,paper and PVC 2.free stretching and bending 3. single-layer aluminum foil, Composite aluminum spiral hoseSpecifications: 10-150 mmMaterial: Aluminum foil, paper, and pvcDescription: The product is made from aluminum foil and paper, pvc and other materials. It has sound flexibility, and can be used for vented exhaust. Composite aluminum spiral hose