**This is uncoated, solid bare copper wire. It is untreated and will tarnish over time.** Our copper is 99% pure and dead soft. This wire is untreated and will patina over time. Grounding Wire Soft drawn bare copper is primarily used for grounding in commercial, industrial, residential, and utility applications. Application is used for passive tracer wire, grounding grid systems, overhead transmission, and distribution systems. Copper wire is flexible and strong, making it easy to work with while maintaining its strength The rating is great for art projects, crafts, jewelry making,