Length: 100 Feet Used for uninsulated grounding applications ASTM B3 standards for annealed copper and complies with the RoHS and directives. Bus Bar Wire Soft Tempered Bare copper wire is an uninsulated wire used for electrical grounding and craft use. This single-strand wire is annealed improved ductility and meets the QQ-W-343 standards for uninsulated wire. It also meets ASTM B3 standards for annealed copper wire and is RoHS compliant. This copper wire is suitable for uninsulated wiring applications as well as in crafts such as jewelry and weaving.