Premium American-Made Acoustic Guitar Strings
Acoustic Guitar Strings for Every Playing Style
Premium American-made acoustic guitar strings built on more than 100 years of American string-making expertise. Designed for exceptional tone, outstanding feel, and longer-lasting performance.
Whether you're looking for the rich, balanced voice of traditional phosphor bronze, the bigger, more responsive feel of round core construction, or the authentic vintage character of the Lost '60s Acoustic series, American String builds premium acoustic strings for every style of player.
Every set is proudly manufactured in America using premium American materials and more than a century of string-making expertise.
Which Acoustic Strings Are Right for You?
The Classic Acoustic Sound
Rich • Balanced • Timeless
Our flagship acoustic string. Rich lows, articulate mids, sparkling highs, and outstanding balance make Phosphor Bronze the perfect choice for virtually every style of acoustic playing.
Bigger Tone. More Feel.
Boomier • Flexible • Responsive
Round core construction produces a richer, more open sound with increased flexibility under your fingers. Perfect for expressive players who want effortless bends, powerful sustain, and an acoustic guitar that feels alive.
Inspired by the Golden Era
Vintage • Organic • Authentic
Inspired by the legendary acoustic strings of the 1960s, Lost '60s Acoustic delivers the warm, woody character, balanced response, and authentic feel that defined an era of incredible recordings.
Compare Acoustic Guitar Strings
| FEATURE | PHOSPHOR BRONZE | PB ROUND CORE | LOST '60s ACOUSTIC |
|---|---|---|---|
| Tone Profile | Rich & Balanced | Bigger & Fuller | Warm & Vintage |
| Playing Feel | Classic | Flexible | Smooth |
| Projection | Strong | Outstanding | Strong |
| Dynamic Response | Excellent | Outstanding | Excellent |
| Warmth | High | Very High | Very High |
| Brightness | Balanced | Warm | Warm |
| Sustain | Excellent | Outstanding | Excellent |
| Fingerstyle | Excellent | Outstanding | Excellent |
| Strumming | Excellent | Excellent | Very Good |
| Flatpicking | Excellent | Outstanding | Good |
| Bluegrass | Good | ★ Best Choice | Good |
| Singer-Songwriter | ★ Best Choice | Excellent | ★ Best Choice |
| Vintage Character | Good | Very Good | ★ Best Choice |
| Recording | Excellent | Outstanding | Outstanding |
| Best Choice For | The player who wants one string that excels in every situation. | The player who wants bigger tone, greater flexibility, and maximum responsiveness. | The player chasing the authentic warmth and character of vintage acoustic strings. |
*New to American String? Start with Phosphor Bronze 12–53. It's our most versatile acoustic string and the perfect introduction to the American String sound.
Which Acoustic String Fits Your Playing Style?
You want one string you can trust every time you pick up your guitar.
Ideal for players who perform a variety of styles and want a balanced, dependable sound.
You love expressive playing and want every bend, vibrato, and note to feel effortless.
Perfect for players who value dynamics, sustain, and expressive touch.
Choose Lost '60s Acoustic if...
You love the warm, organic acoustic sound heard on classic records.
Ideal for vintage guitars, archtops, and players chasing authentic character.
Why Players Choose American String Acoustic Guitar Strngs
Premium American Materials
Manufactured using premium American-sourced wire for exceptional consistency, feel, and tone.
Made in the USA
Every set is proudly manufactured in America with complete quality control from raw wire to finished strings.
100+ Years of String-Making
Built on over a century of manufacturing expertise trusted by many of the world's finest piano makers.
Built to Perform
Outstanding tone, exceptional feel, superior consistency, and longer-lasting performance for serious players.
American String was created to build the guitar strings we always wished existed—premium American-made strings built with uncompromising materials, exceptional craftsmanship, and the tone serious players deserve.
Great Strings ★★★★★ Brian M.
Phosphor Bronze 11-50
These are the best strings I’ve ever had on my guitars. Bought 4 sets for 2 of my old guitars and made them sound like new again. Hold a tune very well, even after using a capo. I’ll be using these from now on.
My 40-year-old Guild D45 has never sounded so sweet ★★★★★ Eddie S.
Lost '60s Acoustic 11-50
My over 40 yr old Guild D45 has never sounded so sweet. The tone and harmonics are thing of beauty. Now they are on all my acoustics. Love them!
Great Finger-Style String! ★★★★★ Thomas S.
Phosphor Bronze Acoustic 12-53
I put a set of these on my Collings OO that I use primarily for finger style playing. Brilliant, clear and maintains great balance. I have some trouble articulating this part, but there’s a smoothness to the feel of these strings that make them a real pleasure to play and for me, it’s something about the texture of the string surface perhaps. Excellent strings!
Good Strings! ★★★★★ M.J.
Acoustic Round Core
I use these strings across the board. 3 Acoustics and 4 Electrics. Easier on the fingers than non round cores. Play more like 10’s with the 12 output. 🙂
Frequently Asked Questions
What's the difference between Phosphor Bronze and PB Round Core?
Both use premium phosphor bronze wrap wire, but PB Round Core uses a traditional round core that produces a bigger, richer sound with a noticeably more flexible feel and enhanced sustain.
What makes Lost '60s Acoustic different?
Lost '60s Acoustic recreates the warm, balanced response and vintage feel that players loved during the classic recording era, making it ideal for traditional acoustic and archtop guitars.
Which strings are best for fingerstyle?
PB Round Core offers exceptional flexibility and dynamic response, while Lost '60s Acoustic provides warmth and note separation. Phosphor Bronze remains the best all-around choice.
Which strings are best for bluegrass?
PB Round Core delivers outstanding projection, responsiveness, and powerful low end, making it an excellent choice for bluegrass and aggressive flatpicking.
How often should I change my acoustic guitar strings?
Depending on how often you play, most players replace acoustic strings every one to three months. Regular players and performers may prefer changing them more frequently to maintain their brightest tone and best feel.
Are American String acoustic strings made in the USA?
Yes. Every American String acoustic guitar string is proudly manufactured in America using premium American materials and more than a century of string-making expertise.
Are phosphor bronze strings better than 80/20 bronze?
American String Phosphor Bronze strings provide a warmer, richer tone with excellent balance and longer-lasting musicality. Many players prefer phosphor bronze because it delivers outstanding versatility across fingerstyle, strumming, recording, and live performance.
When the world's finest piano manufacturers demand precision, they trust our family of companies. We bring that same craftsmanship and commitment to every American String guitar string we build.
Still Can't Decide?
The best way to discover your favorite American String is to play all three.
Our Mix & Match Packs lets you build your own assortment of gauges, cores, and materials so you can experience the differences for yourself.
Play them. Compare them. Find your forever string.
Still can't decide? Build a Custom 3-Pack or save even more with a Variety 6-Pack and experience the entire American String lineup.
