This FasTip nozzle is made of copper. In addition, it is designed for applications including MIG welding. Plus, it is compatible with Spoolmatic 15, Spoolmatic 30, XR-Aluma-Pro, XR-Pistol, 130831, 195156, 198127, 198128, 198129, 198130, 300001, 300003, 300004, 301568, 301569, 301570, 301571, 301572, 301573, Miller brand and is for use with Rough Neck guns, XR/XR-M, XR-A/SPOOLMATIC 15/30A XR-EDGE, XR-ALUMA-PRO. It can be used for MIG welding.