   Wire rope consists of a central core material which is surrounded by strands each of which is made up of several wires. See the drawing below. 
There are a number of ways that the wire rope can be twisted, which is
refered to as the lay. The lay is also used as the lenght along the rope that it takes for one strand to make a full revolution.
A right hand or left hand lay determines the direction the strands are wound around the core. A regular lay has the wires wound in the opposite direction to the strands. A lang's lay has the strands and wires both wound in the same direction. In the drawing the black lines are drawn to show the direction of twist. The right hand regular lay is the most common construction.
The core for wire ropes may either be a fiber core (FC) or
Independent Wire Rope Core (IWRC) which uses a smaller wire rope
as the core.
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