Silver Filled Wire - 18 Gauge Dead Soft Round - 0.5oz (6.25ft) Silver-Filled Wire is 6% fine silver bonded to a brass core. Dead Soft Temper. Round Wire. Size: 18 gauge (0.04in, 1mm). 0.5oz spool, about 6.25 feet. Silver-Filled wire has the same charateristics as sterling silver. Wrap it - Link it - Solder it - Embellish with it