Soft gauge, long scale. An ultra-fine layer of EXP Coating  is bonded to the phosphor bronze outer wrap. The result is  a built-in barrier against the corrosion and wear that can  quickly sap the life out of your strings and your sound.  EXP coated phosphor bronze acoustic bass guitar strings have a natural  round wound feel and sound fresh and bright  with a "new string tone" that lasts three to four times  longer than that of traditional acoustic bass guitar strings.