STAINED GLASS SOLDER: Artist Pure 60/40 is designed with the glass artist in mind for soldering copper foils and came lead. ALLOY: Made with high purity virgin metals for a consistent and smooth flow. Comprised of 60% Tin and 40% Lead SPECIFICATION: 1lb (454gr) spool of solid wire with a diameter of 3mm (0.125") and melting temperature has a range of 361°- 374°F BENEFITS: Stays in a liquidous stage longer allowing more time to produce a smooth, clean bead MADE IN CANADA: Feel free to reach out to AIM for technical support or questions. WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to the offical Proposition 65 Warnings Website.