... Spiral wound gaskets are composed of a steel (inner &.outer )rings and a spiral sealing strip with non-metallic winding ,and ... , it’s suitable for male and female flange. Material for rings:Low Carbon Steel, SS304, 304L, SS316, SS316L, SS321, SS347, ... , JIS, etc.How to order1 -- Nominal pipe size or specific gasket dimensions2 -- Pressure rating3 -- winding and filler materials4 -- centering / outer ...