D'Addario EXL110 Bonus 3 Pack With Balanced Tension Set, Regular Light, 10-46, 4 Sets Round wound with nickel-plated steel for distinctive bright tone Balanced Tension guitar sets are comprised of mathematically optimized string gauge combinations, resulting in greater control and playing comfort. Made in the U.S.A. for the highest quality and performance Bonus 3 Pack includes 4th set in balanced tension gauges.