Built to achieve unmatched tone and playability, Martin Era™ strings set a new standard for what a phosphor bronze acoustic guitar string can be. Combining the best technologies from the Martin Strings lineup, Martin Era strings feature a patented Lifespan® treatment to protect against corrosion, Flexible Core construction to enhance fretability and comfort, and silk-wrapped ball ends—designed with vintage instruments in mind and as a premium touch that symbolizes Martin’s handcrafted string-making history. The Artist Light version was developed in collaboration with six-time GRAMMY® winner Jason Isbell and features a more traditional SP® core to match his signature guitar sound.
| Note/String # | Gauge (mm) | Gauge (in.) |
| E/1 | 0.30 | .012 |
| B/2 | 0.41 | .016 |
| G/3 | 0.64 | .025 |
| D/4 | 0.81 | .032 |
| A/5 | 1.07 | .042 |
| E/6 | 1.37 | .054 |
