24 K gold plated wire with a copper core. 18 gauge (1.0 mm), length is 4 meters. Hard.Our best wire ideal for jewelry applications! Excellent quality for shaping wire, available in 100% Brass, 100% Copper, or Copper Wire plated in Silver or Gold. Seven wire gauges to choose from, ranging from 14-26 gauge. It is a perfect finish for most jewelry wire wrapping uses. This wire has an anti-tarnish coating and can be twisted together or simply used alone.