No. of Strings: 6-String Set Gauge Range: 10 - 52 Gauges: 10 , 13 , 17 , 30 , 42 , 52 . (Plain 3rd) Wrap Material: Nickel Plated Construction: Round Wound Hex Core / Round Core: Hex Core Ball End / Double Ball End: Ball End Coated / Non-Coated: Non-Coated EXL140 is one of D'Addario's most popular hybrid sets, combining the high strings from an EXL110 (.010) with heavier low strings (.052). This combination delivers powerful low end for heavy chording and flexible plain steel strings for bending. Optimized for down or drop tuning! Hybrid gauge combines EXL110 for flexibility with heavier 4th, 5th and 6th strings for a more solid low end 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 .010, .013 .017, Nickel Wound .030, .042, .052 D'Addario XL Electric Guitar strings are world-renowned as "The Player's Choice" amongst guitar players of all genres and styles. XL strings are wound with nickelplated steel and are known for their distinctive bright tone and excellent intonation.