Solidlock Pro 20, 660', 949-12, Professional Strength Fixed Knot Cattle Fence, 12.5G, Class 3, Fixed Knot Design Combined With High Tensile Wire, Strongest Woven Wire Fence You Can Buy, Design Locks The Line Wire & Stay Wire Together, Giving You Maximum Strength, Little To No Maintenance, Great For Cattle, Bison, Sheep, Goat, & Swine.