I purchased these on Amazon, but I ordered too many and can't use them all, so I'm selling them. New Elixir Acoustic Guitar Strings Extra Light x 4 sets These innovative strings use a special, advanced polymer technology to protect the wound strings from sweat, body oils, and dirt, preventing corrosion and allowing them to last 3-5 times longer than uncoated strings, maintaining their original high-quality sound. Since their release in 1997, they have been highly praised by numerous professional and amateur musicians worldwide. NANOWEB ~ Nanoweb Ultra-Thin Coating ~ Nanoweb coated strings achieve a coating thickness that is approximately 30% thinner than Polyweb due to newly developed technology. These strings feature a coating that is incredibly thin, down to the nanometer level. They are very similar to uncoated strings, with a bright sound and a feel so thin that you can barely tell the coating is there. Phosphor Bronze - Extra Light Gauge (.010 .014 .023 .030 .039 .047)