... or synthetic): FC, FC steel wire rope for example. b natural fiber core: NF, such as NF stainless steel wire rope. c ... synthetic core: SF, for example, stainless steel wire rope SF. d metal rope core: IWR (or IWRC), such as ... stainless steel wire rope. e metal strand core: IWS, IWS stainless steel wire rope for example. Five characteristics of stainless steel wire ...