Martin MSP7200 SP Lifespan 92/8 Phosphor Bronze Medium Acoustic Guitar Strings (Discontinued) Leave a Comment / Uncategorized / By Denise / September 13, 2017 88 GEARANK 88 out of 100. Incorporating 150+ ratings and reviews. Street Price: $11.99 Manufacturer: Martin Features Set: MSP7200 Gauge: Medium 13-17-26-35-45-56 Tension: 186.2 Package: 6 strings