Blue Demon #4 Guage Flexaprene welding cable, black, 25', shrink wrapped This is a highly flexible annealed 30 gauge bare copper conductor, insultated with an EPDM jacket and paper separator. Operating temperatures range from -50C to + 105C. Designed for applications where a stinger/whip, leads and grounds are used. Made in USA, this material meets SAE J1127. Rugged jacket and highly flexible, resists abrasion, cut, tear, flame, grease, oil and water.