"EXL117 is an extreme hybrid set, optimally designed for tuning guitars down a whole step to D, while maintaining a comfortable playing tension like that of a ""light"" gauge set.- Hybrid gauges optimized for ""D"" tuning, one whole step down- Round wound with nickelplated steel for distinctive bright tone- Environmentally friendly, corrosion resistant packaging for strings that are always fresh- Made in the U.S.A. for the highest quality and performance- String Gauges: Plain Steel .011, .014, .019, Nickel Wound .032, .044, .056- Environmentally friendly, corrosion resistant packaging for strings that are always fresh"