Never-Rust Aluminum Electric Fence Wire Made from high grade alloy with bright shiny smooth finish to make it highly visible to livestock & humans. Conducts electricity 4 times greater than steel. Lightweight - one third the weight of steel. Easy to re-spool ideal for controlled grazing. Greater flexibility can be hand twisted & tied. Compatible with any charger or accessories. Specs: 17 gauge 1/2 mile spool - 90 lb & Break load Tensile Strength 38 000 PSI 14 gauge 1/4 mile spool - 215 lb Break load Tensile Strength 38 000 PSI PSI-12 1/2 gauge 1/4 mile spool - 360 lb Break load Tensile Strength 50 000 PSI 12 1/2 gauge 1 mile spool - 360 lb Break load Tensile Strength 50 000 PSI 9 gauge 1000 spool- 500 lb Break load Tensile Strength 50 000 PSI 9 gauge 4000 spool 500 lb Break load Tensile Strength 50 000 PSI . NOTE: Because of shipping weights associated with wire we recommend that you check your local area before buying. Even if the wire is slightly more expensive the shipping costs will most likely far outweigh any savings.