Flux Core Wire Diameter 0.9mm 1 Kg E71 T 11; Flux Core Wire Is Gasless And Ideal For Outdoor Use Where Wind Would Play A Factor In Disrupting Carbon Dioxide Mig Welding; It Is A Open Arc Tubular Wire Recommended For Use On 1 And 5 Kg Mig Welders; Ideal For Jobs Where A Gas Cylinder Is Not Able To Be Used; Can Be Used On Unprepared Surfaces And On Most Metal Surfaces And Site Welding.