Silver Filled refers to a process whereby silver is mechanically bonded to a copper core to the extent that silver-filled wire is 10% silver by weight. Silver filled is hundreds of times thicker than silver plating but with many of the same properties as solid silver: parts can be soldered, hammered, oxidized, and tumbled. Best of all, it has the same look as Sterling but at a much lower cost. This Silver Filled Wire is half-hard, making it suitable for most wire wrapping applications. Each coil weighs 1/2 troy ounce (15.55 grams). Lengths listed in the table are approximate. Made in USA.