EFX220, D’Addario FlexSteels bass sets offer a lighter gauge combination while still maintaining a deep, round sound with just the right amount of punch and bite. Fits long scale basses with a string scale length of up to 36 7/8 inches. A monumental breakthrough in bass string technology, FlexSteels deliver the unique combination of flexible feel optimized for slap and finger-style playing coupled with a coveted deep and round tone with just the right amount of punch and bite. A harmonic-rich steel alloy with precisely formulated core-to-wrap diameters wound to the most precise specifications delivers this singular tone and feel with unsurpassed consistency and extra-long string life. Deep, round sound with just the right amount of punch and bite Flexible feel optimized for finger style and slapping player Fits long scale basses with a string scale length of up to 36 7/8 inches Made in the U.S.A. for the highest quality and performance String Gauges: Wound .040, .060, .075, .095 Environmentally friendly, corrosion resistant packaging for strings that are always fresh