Editorial Review Quality Square Craft Wire. Bright Gold Plated Over Solid Copper Core. 21 Gauge / 0.72mm Thick. 4 Yards / 12 Feet. Beautiful quality beading wire made in USA Soft tempered Gold wire with Copper core, use in wire wrapping, create jump rings and links, works great with a Wig Jig. Sturdy 21 Gauge square wire is approximately 0.72mm thick. Package contains one continuous length of gold plated copper wire, 4 yards / 12 Feet long.