 Martin Msp7700 Sp Lifespan Phosphor Bronze Baritone Acoustic Guitar StringsGauges: 14-20-30-42-54-70Martin SP Lifespan strings are the next level in studio performance. Treated for long life, they repel dirt, grit and other environmental elements that can quickly alter the sound of your strings. The treatment is so incredibly thin, you won’t even know it’s there. SP Lifespans are designed to last longer and sound better so you can play on! Accessories, Strings, Guitar Strings, Acoustic Guitar Strings, 6 String Sets for Acoustic Guitar, .014+ Gauge Acoustic Guitar Strings Martin 41MSP7700 Martin, .014+ Gauge Acoustic Guitar Strings |