H07RN F - heavy, rubber tire hose for heavy and demanding applications, e.g. tools, agricultural and mining equipment. For installation in dry and damp rooms as well as outdoors and in drinking water. Strands made of thin copper wires, clean or tinned, rubber insulation, stranded together cores (from 3 cores, one yellow-green - letter G in the marking), outer sheath made of polychloroprene rubber (Neoprene), self-extinguishing.