the silver brazing rod composition combines silver, copper, and phosphorus for reliable joint strength; This silver solder material offers good characteristics and resistance in brazing applications this silver soldering kit contains 30 flux coated brazing rods, providing ample supply for multiple projects; Each rod measures about 0.12 inches in diameter and 19.7 inches in length, ensuring extended working capacity with solidus at about 1190°F and liquids at about 1075°F, these brazing rods operate within a brazing range of 1178 to 1245°F; The thermal window accommodates various heating methods and joint configurations these flux coated brazing rods feature blue flux coating that promotes wetting and bonding at joints; The pre applied coating eliminates the need for additional flux and supports strong capillary action during heating these welding rods effectively join copper, brass, and cast iron materials; The rods work well for copper to copper and brass to bronze connections in HVAC and refrigeration systems, Weight: 0.771617917 Pounds, Manufacturer: Frewurwer