old material, and has a diameter of 0.000-0.0015 inches; [0463] the inner coating (520) is a copper ???strike???, having a thickness of 5-10 ????? (microinches); and [0464] the outer coating (522) is nickel, and has a thickness of 0.0020 inches. [0465] Generally, a coating such as copper would be chosen for two reasons: (i) to enhance the plating ability of the underlying wire stem (as is known, c