Fender Phosphor Bronze Acoustic Guitar Strings Set 60M are stage-ready strings for acoustic guitarists. They offer long durability and a fine response. Fender Phosphor Bronze strings produce a balanced, warm sound, enriched with complex overtones and delicate trebles. They are ideal as accompaniment for singer/songwriters and solo performances, as well as for use with a full band. Gauges: .013, .017, .026, .036, .046, .056. Ball at the end of the string.