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Thomastik-Infeld Acoustic Guitar Plectrum Bronze Flat Wound/Bronze Round Wound Light, .011 - .050, AC111

Thomastik-Infeld Acoustic Guitar Plectrum Bronze Flat Wound/Bronze Round Wound Light, .011 - .050, AC111
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24 Reviews
79% (19)
4% (1)
4% (1)
8% (2)
4% (1)
0% Recommend this product (0 of 24 responses)
By Rob Probst
December 25, 2017
Wound G frayed twice!
Wound G frayed - the winding split and exposed the core. Thomastic replaced the defective G string, but the replacement string did the same thing! At first, I wondered if there was a a rough spot on the fret that was the cause, but no. It happened at the 7th fret on the first one, but at the 12th fret on the second. Upon closer inspection, the winding is dented and close to splitting at several frets. Wonderful tone, but way too fragile. I won't be buying these again.
By Jesse
November 10, 2017
Superior quality and then some.
Finally tried these after hearing about them for years. I'm a musician, a long time pro, live and studio. These are all they are cracked up to be. One strum and I knew. Here's the pros and cons for my personal situation. Pros are a new level of acoustic richness - you will feel like an orchestra musician rather than a guitar picker instantly. The balance across the strings is otherworldly, it's like having a compressor smoothing out your tones, only much better. The only con, besides the price (which is fair, just hard to pay for a retired guy) is that they are quiet. I first put these on the day of a acoustic jam session with several other players. I could not be heard, a first for me. After I got home, I plugged my Martin into my acoustic amp and the results were once again stunning. I will use these exclusively when I'm playing out, especially solo shows, and throw something cheaper and louder on for acoustic jams. They really are something else, if budget allows and acoustic volume is not an issue, try them, they will blow your mind.
By Richard Rausch
November 8, 2017
Plectrum AC111 Great Tonal Choice
I just put a set on my new Lowden F-50c, Redwood and Blackwood Lowdens have a delicate sound, sweet highs, smooth mids and bass, and these strings have the same tonal emphasis. I was looking for a string that was responsive and full, without heavy tension. Coming down in tension from the 13-53's, rendered a perfect feel for me, as I am used to performing with a classical/nylon. Yes there was a small change in volume and attack with my fingers, but well worth the exchange in tone. I am pleased with the quality of sound compared to other strings I am auditioning. So far, these are keepers. I would add that theses strings may be best suited for single guitar finger style.
By Craig K.
May 1, 2016
Thomastik_Infeld AC111
Produce a lot of finger noise and have a rough feel to them.
My fingers catch on the strings when I fingerpick and strum.
Maybe they will improve with time-will see...
By Paul W.
January 3, 2014
Thomastik Plectrums
I play fingerstyle jazz and pop arrangements. I recently switched to a Taylor 914ce after playing a nice archtop. These strings make the Taylor play as easily as a high end archtop, but with a smooth sweet flattop tone. Amazing strings..and they last a very long time. Treat yourself.
By Steve Lochhaas
August 11, 2012
Very impressive strings!
I put these strings on a vintage '77 Yamaha FG335 and it sounds like a Dan Fogelberg record. I was using Martin silk/steels but these have much more presence. It's almost like the guitar has a piezo pickup and the sound is being slightly processed. They are more plyable and feel better, despite the slightly rounder wind. Vibrato is more effective and fret noise was not increased. In fact slides were slightly easier than the flatwounds to me.

I keep picking it up and playing it just to hear the extra sweetness it now has, especially when played fingerstyle. I was also able to play them hard without buzz (If they do, it may be due to the lower tension and the string angle at the bridge- see a good luthier to solve this).

The bottom line is: I will probably buy these again, expensive as they are.
By Tom V.
June 28, 2011
Thomastik-Infield, AC111
Long playing and good tone quality. I've played many brands over the 30+ years of playing, this is now my first pick.
By dave
June 21, 2011
these here plectrum strings
I love these strings! I find them easy to play, great sound, and they hold tune beautifully - better than any others I've tried, and that's a lot. Further, they keep tone forever - I've had a set on for 3 months, and they sound fine, really. I only changed as i wanted a slightly heavier gauge. Worth every penny, for me.
By Dave Matheson
March 28, 2011
Plectrum Strings
I love these strings because of the light touch but also find a lot of buzzing for the same reason. I bought these as an experiment at the same time as buying some Spectrum strings as well. I'm inclined to use Spectrums instead of these strings and may be looking into returning the Plectrums I purchased to exchange for Spectrums. Don't get me wrong - these are very nice strings I just play too heavily to use them. I may also investigate other gauges of Plectrums to try but as I commented on Spectrums these strings aren't cheap compared to other strings out there so I am still assessing whether the high cost is worth the quality.
By Brad
March 4, 2011
I needed lower tension strings for my one-off Brazilian rosewood acoustic with cedar top. These strings are beautiful, with a supple feel. They are less aggressive than many other bronze strings, but perfect for this guitar and how I want to play it. They have a more subtle tone, and finger noise is reduced on wound strings. The coated plain strings provide a nicer transition in feel to the wound ones.
By Michael P.
November 19, 2010
Plectrum acoustic strings .011-.050
This seems like the right set of strings for my Don Musser acoustic. The guitar has a big, clear, full sound without being boomy, and with great note definition. These strings complement those characteristics very well. I particularly like the evenness of tension from string to string - reminds me of a fine jazz guitar set.
By Glen
October 9, 2010
They are not really flat wound strings, but they sound pretty good for my arch top. These guys do make very good strings overall.
By Tom Singer
September 27, 2010
Guitar strings
Theses strings are not flat wound there is nothing flat about them and I am not at all plesaed with them.I had brand new round wounds that were working fine but wanted a easier playing string but these dont play better and dont have good sound.
By Michael Swisher
September 25, 2010
Plectrums add balance & tone
I bought this set of Plectrums for a mid '60'sGibson B-25. I worked on this guitar for a friend who is the original owner.
For those unfamiliar with this model it is a lightweight small-body with a plastic bridge. I tried several string sets, and with an eye to keeping the tension low I included the Plectrums.
The bottom line is that they made the guitar sound very good, much more complex and balanced, and musical. Much better than I had heard with any other set.
I put another set on my wife's entry-level OM (replacing Martin SP lights) and found a similar boost in musicality with the plus of balanced string tension.
They work equally well for finger style and plectrum.
If you are looking for a better than most set of strings, consider trying a set of these.
By Michael
September 15, 2010
Thomastik-Infeld AG Plectrum Strings
Fast delivery and great strings. I've used these strings for over 15 years. Once in a while I try something else but I always return to these Thomastik-Infeld AG Plectrum Strings. Thanks!
By Dave
June 20, 2010
Thomastik strings
Can't say enough good about these - fantastic!
By Mark Tab
February 22, 2010
Thomastik-Infeld AC111
I have been on a search for the best strings for my guitar since 1969 (when I bought the guitar!)

I tried the AC111 - I haven't looked back - the search is over !

They were tough to find locally - but buying thru JustStrings.com is easier than driving all over town and they ship FAST !

Thank You Very much !
By Pete Bensen
February 15, 2010
T-I Plectrum Flat Wounds
Love these strings. Best sound, long-lasting, great bang for the buck.
By JustBrad
February 10, 2010
You Know it when you hear it.
How do you define quality? I rolled up a window on a Rolls Royce once and it was different... it was better than my dad's chevy. That sense of quality has been with me my entire life. Play a set of Thomastik-Infeld's and you'll know what I'm talking about! Simply amazing sound, great playability and they last a long time.
By Rex
November 17, 2009
Thomastik- AC111
Best set of acoustic strings I ever purchased. I love them.
By Carmine
October 6, 2009
Thomastik-Infeld Acoustic Bronze strings
The best strings I have ever used. I have played what is considered the top 6-8 brands, and these beauties win hands down. Tone is gorgeous, bending is easy, they last longer than any other 'non-coated' strings. Amplified or not, the sound is great with clarity, extended highs and solid bass.

Treat yourself one time and you will hear the true potential of your guitar.
By Jeffrey Gilbert
August 14, 2009
Plectrum Guitar Strings
For those of us who play a wide range of music on their acoustic steel strings guitars these strings do it all. Last longer, sound and feel better. I have sometimes had to go to slightly larger gauge trebles to solve issues of 'string slap'. That only made it better still.
By Reynaldo Alva
August 14, 2009
Thomastik-Infeld Acoustic AC111 guitar strings
My favorite acoustic string now. I didn't know they made an acoustic set of strings in flatwound for most of this set. A mellow sound and very little finger string noise when playing which I like. I love the sound of these strings - my choice of acoustic strings to play.
By Pete
August 14, 2009
These are my favorites
I have been playing for over 30 years with many different strings and these have turned out to be my favorites. Enjoy!






1st E

Plain Steel



2nd B

Plain Steel



3rd G

Bronze Flat Wound



4th D

Bronze Flat Wound



5th A

Bronze Flat Wound



6th E

Bronze Round Wound




Plectrum Acoustic Series

characteristics: soft sounding, low tension

"PLECTRUM Acoustic Series are soft sounding strings for acoustic guitar with low tension on the bottom end. The plain strings are made of brass coated steel, the wound strings have a silk inlay in combination with a highly flexible steel core. A, D, G strings are polished bronze flatwound, Bass-E is polished bronze round-wound.

A remarkable string that prompts comments like "I never knew a string like this existed!". The combination of lower overall tension, hybrid arrangement of flatwounds with roundwounds and silk inlays (for precise overtone balance) produces a beautiful, almost classical tone, with the warmth of bronze and the easy playbility of a fine set of jazz strings. And because of its low, evenly balanced tensions, Plectrums can extend the playing life of many fine older guitars with weak bracing and other special age conditions.

PLECTRUM are available for 6- and 12-string instrument.



Founded in 1919, one of the world's largest manufacturers of strings for musical instruments has applied 76 years of experience to develop a new generation of strings.


Vienna, music capital of the world


Our strings are handmade by highly qualified specialists. With our extensive quality control via computer and signal processing equipment, we have successfully combined Old World craftsmanship with state of the art technology.


The results of our research and our scientific approach to string manufacturing -- based on cooperation with musicians and scientists -- have led to the creation of a new line of guitar strings that is exactly what professionals are calling for.


Guitar strings for creative musicians.

THOMASTIK-INFELD is the best kept secret in the music industry. Did you know that for decades most of the great jazz and classical guitar players have chosen THOMASTIK-INFELD strings? Old World quality and experience, combined with the most advanced modern technology available, give you creative tools to meet the highest standards of performance. Perhaps the time has come for you to discover what a chosen few have know for years? THOMASTIK-INFELD cares about the needs of professionals and amateurs. Worldwide."


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