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 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 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 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 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: Kueohse