D'Addario EJ32C Nylon Ball End Folk Guitar Strings EJ32C Folk Nylon strings feature silver wound basses, clear nylon trebles, and D'Addario ball ends to accommodate a variety of guitars and string changing options .028, .032, .040, .031, .037, .045 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.