Rooster Farms 500m Dog Fence Underground Boundary Wire Cable - For TP16 CollarRooster Farms 500m Dog Fence Underground Boundary Wire Cable For TP16 Collar This is a 500 metre roll of Electric Boundary Wire with an extra thickness of 1mm, usually used with our TP16 Electronic Dog Fencing System for pet containment. This cable will allow you to expand the boundary of your fence system. Please note this is the cable wire only and not the full system. Features and Specifications: Flexible and durable Standard core boundary wire