The original low temperature melting solder; known as the Hardest soft solder on earth. Melts at 275 degrees Fahrenheit and has a holding power of 4300 PSI. Adheres to all ordinary materials that are hard to solder. Works with gun, iron, torch or soldering machine. Stays white and does not tarnish. Comes in 3" sticks and 20 sticks per package. Solder does contain small amount of lead.