Check the listing for details. 3 Sets D'Addario EJ13 80/20 Bronze Acoustic Guitar Strings Custom Light, EJ13-3D. Condition: New. Listed at 18.94 USD. 3 Sets D'Addario EJ13 Custom Light EJ13-3D 80/20 Bronze Acoustic Guitar Strings 11-52 3-Pack (Shipped as a EJ13-3D Pack for Total 3 Sets) Referred to as Custom Light, EJ13 strings are a D'Addario original hybrid gauge and a comfortable compromise for players who want the depth and projection of light gauge bottom strings, but slightly less tension on the high strings for easy bending. 80/20 Bronze, commonly referred to as brass, is the original acoustic string alloy selected by John D'Addario Sr. and John D'Angelico in the 1930s. 80/20 Bronze strings are popular for recording due to their crisp, deep and projecting tone and appeal to many traditionalists and vintage enthusiasts for their historical significance. Custom gauging for balance of projecting tone and lighter plain strings for comfortable bendingExtra-bright tone mixed with deep and projecting bottom endEnvironmentally friendly, corrosion resistant packaging for strings that are always freshMade in the U.S.A. for the highest quality and performanceString Gauges: Plain Steel .011, .015, Bronze Wound .022, .032, .042, .052