2.5 mm galvanised steel for greater conductivity. For under gate and lead out applications. Suitable for all properties 2.5 mm (12.5 ga) galvanised steel for greater conductivity 3 x more conductive than 1.6 mm (16 ga) underground cable Use with Stafix Joint Clamps Resistance of 35 ohms / km Easy to strip with soft steel core for greater flexibility. 3 year warranty