Length: 25 Feet Used for uninsulated grounding and electrical applications ASTM B3 standards for annealed copper and complies with the RoHS and RoHS 2 directives. Bus Bar Wire Corrosion and oxidation resistant Tinned copper wire is a single strand wire with a tin plate coating. It is used in a variety of uninsulated applications including electrical hook-ups, jumpers, and grounds. It can also be used to make jewelry. This wire meets the ASTM B3 standards for annealed copper and complies with the RoHS and RoHS 2 directives.