The Forney 42296 4043 Aluminum MIG Welding Wire features 5-Percent silicon content and a bright finish. For truck bodies, pressure vessels and structural members. Dark gray color-coded label. Forney Industries is one of America's longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5,000 products for the hardware, automotive, farm and ranch and do-it-yourself markets. If you've got metal working questions, we've got answers. We're committed to your success regardless of location size or needs..035-Inch (.9mm) Wire Diameter. 1 pound (.454 Kg) spool. Tensile Strength is 33,000 PSI. Polarity: DCEP Reverse. Shielding Gas: Argon. Proof of purchase required.