This single high tensile wire provides excellent conductivity and longevity for use in permanent electric fence systems.
The single line has less resistance therefore offers better conductivity, simply, your power goes further with minimal loss. 
The zinc coating gives a higher performance than many other forms of fence material.
The tensile strength offers a great degree of security which are able to take loads in excess of 500kg without distortion.

2.5mm dia wire
Approx 650m  long per 25kg coil

Regularly used by profesional fencing contractors as a base wire when erecting stock fence.