D'Addario EXPR170 Reds Bass Guitar Strings, Light, 45-100, Long Scale EXP/Copper coating for a more "acoustic" tone on basses with magnetic and/or piezo pickups Round wound with nickelplated steel for a distinctive bright tone with clear fundamentals Fits long scale basses with a string scale length of up to 36 1/4 inches Made in the U.S.A. for the highest quality and performance String Gauges: Wound .045, .065, .080, .100