Mig Welding Wire, AWS Classification ER70S-7, Material Carbon Steel, Process MIG Welding (GMAW), Wire Diameter 0.03 in, Tensile Strength (As Welded) 70 ksi (80 Percent Argon/20 Percent Carbon Dioxide), 82 ksi (98 Percent Argon/2 Percent Oxygen), Yield Strength (Minimum Required) 58 ksi, Yield Strength (As Welded) 58 ksi (80 Percent Argon/20 Percent Carbon Dioxide), 68 ksi (98 Percent Argon/2 Percent Oxygen), Spool Type Plastic Spool, Series ER70S-7, Weight 44 lb WARNING: This product can expose you to chemicals including Carbon monoxide, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. - Nickel (Metallic)