The Martin MA550 is part of Martin's Authentic Acoustic SP® (Superior Performance) string line — a straightforward, uncoated phosphor bronze set sized for players who want the full projection and body that medium-gauge strings deliver. At .013–.056, these sit right in the middle of the acoustic string spectrum: more tension and volume than lights, without going into heavy territory.
Martin builds these on a high tensile-strength steel core that's tin-plated across all six strings for corrosion resistance, then wraps the wound strings in 92/8 phosphor bronze — that 92% copper, 8% tin alloy known for its warm, balanced character. The result is a round-wound, uncoated string with consistent feel and response set to set. These are the same strings Martin has produced in-house for decades, built to the same standards they apply to their guitars.
Product Features:
- 92/8 phosphor bronze winding on wound strings
- Medium gauge: .013 | .017 | .026 | .035 | .045 | .056
- High tensile-strength, tin-plated steel core for corrosion resistance
- Round wound construction, uncoated
- 6-string acoustic guitar set
- Part of Martin's Authentic Acoustic SP® (Superior Performance) line
Brand: Martin
Model: MA550 Authentic Acoustic SP® Phosphor Bronze Medium
SKU: MA550
Condition: New
Since 1872, C.A. House Music has been helping musicians across the Ohio Valley find the right gear -- with real advice from a team that actually plays. We're your authorized dealer of all the big names in guitars, keyboards, band instruments, drums, pro audio, and more. With four family-owned and operated locations in Ohio and West Virginia (plus a full online store), you don't have to go far for instruments, lessons, rentals, and repairs. No matter your musical needs, our team of musicians wants to help you Play Music for Life.
