Product Description This spool of American Terminal AT-31604 Solder contains 4 ounces of 1/16" solder with a leaded rosin flux core. The 60% tin, 40% lead combination is perfect for jobs like fine electrical soldering which requiring lower melt temperatures. AlphaFry is the company that produces the product, Alphametals is the brand on the roll of solder. From the Manufacturer 60/40 Electrical Rosin Core Solder AM31604.