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Thomastik-Infeld Acoustic Guitar Plectrum Bronze Flat Wound/Bronze Round Wound Medium Light, .012 - .059, AC112

Thomastik-Infeld Acoustic Guitar Plectrum Bronze Flat Wound/Bronze Round Wound Medium Light, .012 - .059, AC112
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21 Reviews
76% (16)
10% (2)
0% (0)
0% (0)
14% (3)
14% Recommend this product (3 of 21 responses)
By Albert
Great strings , but
June 8, 2022
T-I are the top of the line strings but they are admittedly very expensive. I use several different models of their strings on different guitars and they have all been excellent.
Just Strings carries all of the strings I need and the service has always been top rate
My instruments and my fingers like them ! Price
By Matthew M.
Great but pricy
October 15, 2020
Great strings as always from this manufacturer.
Put on my larrivee parlor and these really brought the guitar to life. Very expensive strings and somewhat of a luxury purchase but if you have the extra money to spend they are worth it.
Sound, feel Price
By Francis B.
Pitt. Pa
Guitar strings
November 8, 2019
These strings are awesome they make my guitar so much better to play and the tone is awesome and there lasting well they still after a few plants are very very clean and tone is great
By Pat
Careful with these
July 14, 2019
I had 2 strings (G and A) break trying to tune them up. I presume I just had a bad batch, but in 50+ years I have never had 2 new strings break, so there must be some sort of serious quality control issue.
Beautiful sound if you can get them on without them blowing up in your face. Too fragile and poorly designed to use.
By Richard R.
TOI_AC112 vs TOL_AC111
November 16, 2018
I have been using the AC111's on my F-50, my Taylor K14ce BE, and have recommended them to other players who love the tension balance and tone. I thought I would try the AC112's on my Taylor 812, anticipating the same positive experience. The AC112's felt and sounded like a different string in a negative way. They were dead and scratchy sounding and were much much stiffer than I expected with the shorter scale guitar. Generally I love Thomastik strings. I use this brand on my archtops, basses, and classical guitars. The one experience with Plectrum AC112's was not good. Perhaps it was just a bad set!
By JayDizzle
Great and Great
January 22, 2015
Have a 000 Martin, and these are perfect. Very rich tone. Hard to describe. You need to try them. They feel and look beautiful. Press buy.
By Matthew W.
12's or 11's?
November 22, 2013
This string maker may do well by adding a phosphor bronze of the same line (may cost more). The low E .59 is huge! Be aware that if you have a string through bridge it can be difficult to get the string through (Lowdens). The 11's are good but more like ex-lights and the 12's are really light gauge (with a very large low E, even though the tension is still considered light gauge). Can be a rich sound, what would the phosphor bronzes be?? hmmm.
By David C.
Not worth the money!
October 14, 2013
Not worth the money!!! I was surprised in the lack of volume and ring they were not as easy to play as advertised...I find the Martin strings sound better and 4 times cheaper.....
By Ryan L.
Best strings I've found
August 6, 2013
Hands down, the finest acoustic guitar string I have ever used! They do what they say.. low tension and great projection. Awesome!
January 3, 2013
I realize not everyone likes the same thing. This is especially true for guitar strings, different sounds, feel, gauges, etc. But if you like strings that can make a Yamaha sound like a Martin, that are easy to play, that last a very long time, have a great deep bottom and very consistent highs, and easy on the fingers...well you will love these. Yeah, they're pricey, but worth it. I played $5.00/set Martin Marquis for years, but never again. You won't regret it!
TI Plectrum 12's
June 21, 2012
Jackpot!! I previously had TI Spectrums (12's) on my Larrivee OO's. They sounded amazing but I wanted a little lower tension without sacrificing projection. The Plectrums were the answer! These are the most playable, comfortable strings I've ever played. Others who commented that they are perfect for small body guitars were spot on. Thank you for helping me discover these wonderful strings.
By Bob C.
TI strings
May 24, 2011
I'm not much of a picker, but these strings DO seem to have a great tone and they keep the tension down, which makes things just that little bit easier on the fingers. I have them on a Larrivée D60SH. They just feel good.
By Framus
Best strings for smaller guitars
April 27, 2011
These are by far the best acoustic guitar strings for small-bodied instruments. They turned my vintage Framus archtop into a totally different instrument. Well worth the money!
By James C.
Thomastik-Infield strings
June 11, 2010
Hands down, the finest acoustic guitar string I have ever used!
By Herb
Super Strings
May 15, 2010
I play on a Luna Muse Parlor guitar playing a wide range of music, both using a pick and fingerstyle. These are by the far the nicest sounding strings for both techniques.
By walter w.
htomastik acoustic strings
March 20, 2010
By far the best strings I have ever tried, and i have tried almost every brand out there. These strings actually made my Martin guitar sound better and play easier. It's my choice of string from now on.
By Luke B.
Product Reviews for Thomastik-Infeld Acoustic Guitar Plectrum Bronze Flat Wound/Bronze Round Wound Medium Light, .012 - .059, AC112
November 3, 2009
Great strings! They improved the tone of my 60s Martin 00-18 tremendously. I recently used them in a performance on this guitar and thought they sounded fabulous. A little pricey but worth every penny in my opinion.
By Blake
TI Plectrum Strings
November 2, 2009
I bought a set of these because I too love TI's electric strings...and now I love their acoustic offerings as well. I play a rather delicate Larrivee and these strings just seem to be made for fingerstyling it. Most American-made strings tend to be generic and undifferentiated. Hand someone a guitar with the Plectrums installed and they will immediate sense the difference in playability and sound. Expensive and worth every pfennig...but, I would not recommend these if you're doing bluegrass, or banging away doing Le Pompe a la Django with a 2mm Wegen. Like my Larrivee, they just seem...well, delicate.
By Baxter S.
Plectrum bronze flatwound/bronze round wound
November 1, 2009
The best I've been able to find for my Guild acoustic 6 string. Can't be beat!!!
great Beatles vibe
September 27, 2009
I bought these as an experiment as I LOVE T-I electric flatwounds. I have an inexpensive but great playing acoustic (Cort Earth 50) and these strings sound GREAT. I am getting a early Beatles type sound from my guitar and I couldn't be happier. They are advertised as low tension and this is 100% true, my guitar plays very easily with them.
By JG V.
Plectrum Strings
August 14, 2009
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. They are superb on smaller bodied instruments and are far and away the best finger-style strings ever! For those of us who use finger picks you will be amazed by the response and attack of the smooth wound basses. Also they keep their promise of being kind to older instruments--let me know if it gets better than this.






1st E

Plain Steel



2nd B

Plain Steel



3rd G

Bronze Flat Wound



4th D

Bronze Round Wound



5th A

Bronze Round 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. G string is polished bronze flatwound, A, D, and Bass-E are 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.

THOMASTIC-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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