EJ33 Folk Nylon strings feature 80/20 bronze basses, clear nylon trebles, and D'Addario ball ends to accommodate a variety of guitars and string changing options. D'Addario Folk Nylon strings are constructed with high quality nylon and a ball end on each string to facilitate easy installation on classical or steel string acoustic guitars, if desired. Clear Nylon Trebles, Ball-ends on each string to accommodate a variety of guitars, easy string changing, Environmentally friendly, corrosion resistant packaging for strings that are always fresh, Made in the U.S.A. for the highest quality and performance. Gauges: .028, .032, .040, .031, .037, .045.