D'Addario EJ32 Folk Nylon Silver Plated Copper/Black Nylon Ball End Guitar Strings D'Addario Strings EJ32 Folk Nylon strings feature silver wound basses, black 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