More 11++ Martins Guitar Acoustic Strings. We generally string martin guitars with 92/8 phosphor bronze strings due to the consistency of the strings, however some models will ship with 80/20 bronze. We also have their bronze mandolin strings, nickel wound vega banjo strings and nickel alloy dulcimer strings. Martin guitar ma540 authentic acoustic light guitar strings, 92/8 phosphor bronze. Martin guitar has created the finest guitars & strings in the world for over 180 years.