Elixir Strings Nanoweb Phosphor Bronze Acoustic Guitar Strings -.010-.047 & .010-.027 12-String Light12 string acoustic guitar strings constructed with phosphor bronze wrap wire Played for a dynamic balance of rich, full bodied tone and sparkling high end clarity NANOWEB Coating provides a smooth feel Our coating technology protects against common corrosion and debris buildup, extending tone life longer than any other brands coated or uncoated strings (Elixir Strings player survey) America's #1 acoustic guitar string brand (MI SalesTrak US $ Vol) 12