19 strand measures .015 inch (.38 millimeter) diameter on a 30 foot spool. Designer Series Satin. Now you can add the look of gold and silver to your designs without the cost of precious metal. Incorporate this metallic nylon coated and modern looking wire into your jewelry. The special coating is silky-soft so your designs will puddle in your hand more naturally and feel as if they were made on a single strand of silk. The wire underneath the coating is made of stainless steel for strength and durability. Use satin coated wire for stringing crystals gemstones and glass beads for long lasting results.