​Martin Era™ Treated Acoustic Strings.

At Tone Tailors, we’ve seen a lot of "high-tech" strings come and go, but what Martin has done here is different. They haven’t just added a coating; they’ve created a "super-string" by merging three of their most successful technologies into one single set.

Here is exactly what makes the Martin Era Treated strings the most advanced option in our acoustic room.

The "Trifecta" of String Tech

The Era Treated line isn't just one feature; it’s a combination of three distinct Martin innovations:

1. Patented Lifespan® Treatment: Unlike "coated" strings that can feel slippery or sound muffled, this is a molecular-level treatment. It protects both the core and the wrap wire from the oils and acids on your hands without dampening the natural vibration of the phosphor bronze.
2. Flexible Core Construction: Most of the Era Treated sets (Custom Light, Light, and Medium) utilize a thinner core wire with a thicker wrap. This results in lower tension, making your guitar feel effortless to play and much easier to bend notes.
3. Marquis® Silk-Wrapped Ends: Look closely at the ball ends and you’ll see the signature red silk. This isn't just for aesthetics; the silk provides a soft buffer between the string and your bridge plate, preventing the metal from "chewing" into the wood over time.

The Jason Isbell Connection: SP Core vs. Flexible Core

In a cool twist, Martin collaborated with Jason Isbell for a specific "Artist Light" version of these strings. There is a key technical difference here that players should know:

• The Standard Era Treated Sets: These feature the Flexible Core. They are designed for maximum comfort, reduced finger fatigue, and a soft, "broken-in" feel. If you find standard Light strings too stiff, these are your answer.
• The Jason Isbell "Artist Light" Set: Jason needs a string that can withstand a heavy touring schedule and aggressive strumming. His signature set uses a Traditional SP® Core. It offers more resistance and a firmer "snap" under the pick, providing the high-tensile strength required for professional stage use while still keeping the Lifespan treatment and silk-wrapped ends.

Why "Treated" is Better Than "Coated"

The biggest complaint we hear at the shop about longevity-focused strings is that they "kill the tone."

Because Martin Era strings are treated rather than coated, they retain the "shimmer" and harmonic complexity of a fresh set of phosphor bronze. You get the longevity of a coated string (lasting 2–3 times longer than standard strings) but with the organic grip and tactile response of a natural string.

The Tone Tailors Take

If you’re playing a premium acoustic—whether it’s a vintage D-18 or a modern custom build—the Era Treated strings offer the ultimate "insurance policy." They protect your bridge plate with silk, protect your tone with the Lifespan treatment, and protect your hands with the Flexible Core.

Pro Tip: If you’re a fingerstyle player or a beginner struggling with hand fatigue, go for the Era Treated Light (MP540T). If you’re a heavy hitter who wants maximum stability and a classic feel, grab the Jason Isbell Artist Lights (MJI12T)