Dunlop .011 Gauge Acoustic Guitar Strings
The standard material for acoustic guitar strings has been phosphor-bronze for decades, but if you're interested in doing things a little differently, there are some options that buck the trend with unique alloys. That could mean going for an old-fashioned metal blend, such as in the Martin MM11 Retro Series Custom Light Acoustic Guitar Strings, or it could mean extracting a little more projection and clarity from your instrument with a specialty set like the Ernie Ball Aluminum Bronze Light Acoustic Guitar Strings, which are also touted as lasting quite a bit longer than traditional bronze strings.
Of course, if you want the maximum possible lifespan out of your .011 gauge acoustic guitar strings, then you're looking for a coated set. Old-fashioned coatings tended to add bulk to the strings and had a noticeable effect on their sound, and for guitarists who prefer that, there are still strings with that kind of thick coating. On the other hand, if you're looking for a set of strings that look and sound like uncoated strings but have the durability of coated ones, check out something like Elixir's Nanoweb series or Cleartone's Coated Extra Light Acoustic Guitar Strings. Elixir and Cleartone are both famous for developing ultra-thin coatings that don't alter the sound of the strings.
There are plenty of modifications that can be made to an acoustic guitar, but none are easier or more impactful than a string swap. And since even the best strings have a limited lifespan, you might be coming due for a new set even if you're not interested in changing your guitar's tone. Either way, there's a set of .011 gauge acoustic guitar strings here for you: if you want to stick to what you've already got, just pick up another set of the same thing. Or go with something new and experiment away - that's your choice to make!