The three basic wire rope cores are fiber core(FC), independent wire rope core(IWRC), and wire strand core(WSC). 

We select the most appropriate core for a given application, although steel cores (WSC or IWRC) can provide greater support than a fiber core.

19 x 7(18x7 WSC) Non-Rotating:

19x7 is a multi-strand rope consisting of two strand layers closed in opposing directions. Torsional forces generated by each layer of the rope counteract one another to minimize rotation.