Flex-A-Prene Welding Cable copper stranding is Sae approved, ensuring customer satisfaction, safety, and quality. Highly flexible annealed 30 gauge bare copper conductor, insulated with an Epdm jacket and paper separator. Operating temperatures range from -50?C to +105?C (-58?F to +221?F). Rated to 600 volts. Meets or exceeds Astmb-172.