Sterling Silver Wire. 18 Gauge, Round, Half Hard. 1 Ounce / Approximately 12 Feet Of Wire. Can t stop wire wrapping? Save money, buy in bulk. This gauge and hardness of Sterling Silver wire is perfect for making items such as clasps that need to have more body to them. Need any easy way to harden your wire creations? Check out our Wire Whacker. NOTE: Each lot is approximately one ounce in weight, and approximately 12 feet long.