Includes two main units. Elixir strings use a special, advanced polymer coating technology to protect the strings from sweat, body oils, and dirt, preventing corrosion. These innovative guitar strings preserve the high-quality sound of new strings for a long time and are highly praised by numerous professional and amateur musicians worldwide. Optiweb coating features an innovative lightweight coating that delivers the same tone and feel as non-coated premium strings. Light Heavy gauge (.010 .013 .017 .032 .042 .052)