These 12-string Sets are specifically designed for 12-string acoustic guitars, which have 6 pairs of strings, with each pair consisting of one high and one low string that are tuned to the same pitch. These sets are designed to produce a rich and complex sound, with the high and low strings ringing together when played. The gauges of the strings in a 12-string set are carefully balanced to ensure consistent tone and brightness, and the Nanoweb coating used by Elixir Strings makes them feel like more traditional uncoated strings.