Strands are designed with various combinations of wires and wire sizes to produce the desired resistance to fatigue and abrasion. Generally, a small number of large wires will be more abrasion resistant and less fatigue resistant than a large number of small wires.
 

	Single Size	The basic strand construction has wires of the same size wound around a  center.
	Seale	Large outer wires with the same number of smaller inner wires around a  core wire. Provides excellent abrasion resistance but less fatigue resistance.  When used with an IWRC, it offers excellent crush resistance over drums.
	Filler Wire	Small wires fill spaces between large wires to produce crush resistance and  a good balance of strength, flexibility and resistance to abrasion.
	Warrington	Outer layer of alternately large and small wires provides good flexibility and  strength but low abrasion and crush resistance.
	Seale Filler Wire	Many commonly used wire ropes use combinations of these basic constructions
	Filler Wire Seale
	Warrington Seals
	Seale Warrington Seale
	Multiple Operation	One of the above strand designs may be covered with one or more layers of uniform sized wires.