Soft Flex® Craft Wire is a high quality, permanently colored copper wire. Due to a special enameling process, it is resistant to scratching, peeling and marring. After the enamel is applied, the wire is then clear coated to prevent tarnishing. Bare Copper is the only wire in the line that is not treated. If antiques and old findings are your medium, Bare Copper will patina - perfect for making that new project look like an heirloom.Quality Soft Flex® Craft Wire is 100% lead and nickel free. There are no other metals used in the wire production other than copper and fine silver. The temper of the wire is soft. It is firmer than similar wire products offered on the market, which are typically only available in dead soft and can't be tempered to half hard.