Charted as the pinnacle of Martin's phosphor bronze fleet. Era™ strings dock the best tech in the Martin lineup: patented Lifespan® treatment to fend off corrosion, Flexible Core construction for effortless fretability, and silk-wrapped ball ends — a premium nod to Martin's handcrafted heritage and a friendly fit for vintage instruments. The Artist Light variant, developed with six-time GRAMMY® winner Jason Isbell, swaps in a traditional SP® core to lock in his signature acoustic voice. A new orbit for what phosphor bronze can be.

Gauge: Medium .013-.017-.026-.035-.045-.056

Tension: 190.40

Model: MP550T

Promoted similar listings













ConditionBrand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.Learn more
Brand
Model
  • Martin Era Treated Acoustic Guitar Strings Medium MP550T - .013 - .056
Categories

Product safety information may be available here.

Interstellar Guitars

San Antonio, TX, United States
Joined Reverb:2025

Reverb Protection

Simple Returns, Secure Transactions, Human Support

Learn more

Secure Checkout

Reverb Gives

Your purchases help youth music programs get the gear they need to make music.

Oops, looks like you forgot something. Please check the fields highlighted in red.