Martin Lifespan 2.0 Phosphor Bronze Medium Acoustic Guitar Strings benefits from next generation technology, which enhances performance by providing superior resistance to corrosion. The core wire and wrap wire is protected to prevent corrosion for a much playing feel and enhanced tone. Whether you're kicking back and jamming along to your favourite tracks, playing with friends or performing on the stage, the Lifespan 2.0 strings enable you to do it in style. The medium gauge of the 13-56s make them ideal for strummers who like to belt out a tune with gusto. Whatever style of music that you're performing and whether you're a soloist or ensemble player, this medium gauge set will ensure that you are heard loud and clear. Each string rings out beautifully so you can rest assured that the subtle nuances of your performance will shine through. From busking on the street to playing in an intimate venue to a festival stage, the Lifespan 2.0 medium acoustic guitar strings allow you to sparkle anywhere the music takes you. Established way back in 1833, Martin have a wealth of experience when it comes to their craft. They are continually evolving to ensure that they are at the top of their game, and the Lifespan 2.0 Phosphor Bronze Medium acoustic guitar strings set a fine example for others to follow.