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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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34 Reviews
79% (27)
6% (2)
3% (1)
9% (3)
3% (1)
26% Recommend this product (9 of 34 responses)
By David M.
New York
string quality
May 12, 2022
The quality and sound with these strings is amazing. Like the flexibility in bending and tapping on an acoustic guitar.
Easy to bend Gives a great sound Take no time to change strings None I can thing off
By Alan
Tucson, AZ
Incredible strings
January 12, 2022
Am so glad to have discovered these flat wound strings! Not only so they sound good but my fingers absolutely love them. String squeak is practically eliminated. I am curious to see how long they last, but at this point Thomastik-Infeld has an extremely satisfied new customer.
Smooth, silky feel with very little string squeak. Expensive
By Rob
The Dalles, Oregon
Solved the problem
October 2, 2021
I had been trying different brands of strings for over two years, in order to minimize the sound of finger-squeaking in my solo guitar recordings. These strings do a very good job of reducing that noise. The 6th string, tho, is round-wound...I would guess because a flat-wound string might sound too dull. For my purposes, however, I would prefer all the strings to be flat-wound...still searching for that set.

Also, I would really prefer them to be less expensive...but, we get what we pay for in this world...
Warm tone that I prefer for my guitar recordings; minimal finger noise Price; 6th string is round-wound
By Rene D.
Love these strings
September 29, 2021
Been using these strings for years. Have tried other strings over the years, but these are the best Strings I ve ever used. I use them on my Martin and my Taylor. Use the same brand on my strat. Low tension and being flat wound makes it much easier to play with my old fingers. The low e is not flat wound which gives it a nice low bass sound. Plus they last a long time.Great for fingerpicking.
Easy to play, sounds great, last for months None
By Vladimir
Washington, DC
I love those strings!
August 8, 2021
They sound without too much ringing, low tention, polished ( much less squicking.
By daniel
TI Strings purchase
December 22, 2020
Thank you for following up on the back order. 1026247.
Appreciate the update and the free shipping.
good update/comms/status none
By Paul
Northern New Jersey
It's All About The Tone...
October 21, 2020
I discovered T-I Plectrum strings two decades ago. They have a wonder (to my ear) tone. I have used on my Breedlove and current Taylor. I sent a set to a friend for her to try out on her Martin and she fell in love with them too.
Again, its the tone of these strings. I always order in multiple sets, as they are not found in general music shops. Out side of that, there are no "cons" to these strings.
By Tim L.
Cape Cod
August 8, 2020
I think Thomastik-Infeld make the best guitar strings you can buy, so I was surprised the quality of these strings did not hold up too well. I don't change string that often and will keep the same ones on for months, so for you this might not be a problem. The 3 string (G) started to unwind w/o any noticeable damage. Wouldn't get them again.
They have a really nice feel, with no finger 'scrapping'. Wear out much too quick.
By Richard R.
Annapolis, MD
AC 111 Long Term , 2nd Review
September 1, 2019
My search for the ideal string for use on my Lowden F50 and Taylor K14ce BE has reached the end point. After installing AC111’s on the Lowden Nov 2017, I never took them off; they just sounded and felt too good change them. I went on to use the Taylor as a test bed, because of the Koa construction, which is similar to the Tasmanian Blackwood in the Lowden. After an obsessive 30 string changes on the Taylor, the only string I plan to use n the Lowden is the AC111. The original set from 2017 nearly Two years later, played daily, are still on the Lowden, and still sound wonderful. As for the Taylor, the 31st and last trial set (Thomastik Infield Spectrum 11-50) goes on this afternoon. Even though the AC111’s are lighter in tension they just sound perfect to me. I play only with my fingers. If the Spectrums don’t meet appropriate expectations, the Taylor will also be AC111 bound.
As a side note, The AC112 set is a completely different experience, not nearly as sensuous in sound or responsiveness.
Balanced tension, 3 dimensional sound, ease of playing, longevity, are major features Less amplitude, light tension, and cost my be disadvantageous for some players.
By Rene
Cumberland, RI
Love these Strings
January 22, 2019
Just to be clear - Plectrum 11-50 strings.
I've tried 4 different brands on my Martin Custom Jumbo, all were good, but these Strings -
I read a review about how the strings were better after a couple of days on the guitar; I thought that guy was nuts -
he was right. For some reason they seem to come alive.
There is very little string noise and they have less tension so my old hands with a bit of
Arthritis are really enjoying playing again.
The guitar now has the power that a Jumbo should have, plus I have an ease of playing
I also use Flatwounds on my Strat, that's why I tried these. My new go-to company for all
my Guitar strings.
Yes they cost a bit more, the quality and sound is worth it
Very little string noise great playability None
By Rob P.
Wound G frayed twice!
December 25, 2017
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
Superior quality and then some.
November 10, 2017
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 R.
Plectrum AC111 Great Tonal Choice
November 8, 2017
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.
Thomastik_Infeld AC111
May 1, 2016
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.
Thomastik Plectrums
January 3, 2014
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 L.
Very impressive strings!
August 11, 2012
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
Thomastik-Infield, AC111
June 28, 2011
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
these here plectrum strings
June 21, 2011
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 M.
Plectrum Strings
March 28, 2011
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.
Plectrum acoustic strings .011-.050
November 19, 2010
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 S.
Guitar strings
September 27, 2010
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 S.
Plectrums add balance & tone
September 25, 2010
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
Thomastik-Infeld AG Plectrum Strings
September 15, 2010
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
Thomastik strings
June 20, 2010
Can't say enough good about these - fantastic!
By Mark T.
Thomastik-Infeld AC111
February 22, 2010
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 B.
T-I Plectrum Flat Wounds
February 15, 2010
Love these strings. Best sound, long-lasting, great bang for the buck.
By JustBrad
You Know it when you hear it.
February 10, 2010
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
Thomastik- AC111
November 17, 2009
Best set of acoustic strings I ever purchased. I love them.






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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