20 Gauge Round Silver Filled Wire. Approximately 11 feet. 0.81mm in diameter and 0.5ozt in weight. Silver Filled Wire has a layer of silver that equals 1/10 of the weight of the wire bonded to the outside of the base metal core wire. It can be polished, soldered, and has the same look at a much lower price than Sterling. This wire is 1/10 Silver Filled CDA220, Half Hard, which means that it is 10% sterling silver. With half hard temper, this wire is suitable for most wire wrapping applications. Use Silver Filled Wire to create wire wrapped fine jewelry!