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Thomastik-Infeld Acoustic Guitar Spectrum Bronze Round Wound Medium Light, .012 - .054, SB112

Thomastik-Infeld Acoustic Guitar Spectrum Bronze Round Wound Medium Light, .012 - .054, SB112
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11 Reviews
91% (10)
9% (1)
0% (0)
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0% (0)
9% Recommend this product (1 of 11 responses)
By Vance E.
Katy, TX
Expensive and high quality
December 23, 2020
The Thomastik-Infeld bronze strings are really superb quality. Both the Spectrum and Plectrum varieties work very well on my custom Kinnaird OM (Lucky Strike redwood on ziricote). The Plectrums have a softer, mellower tone and require a guitar with good sustain and strong overtones. The Spectrums are zingier and probably more useful on medium range guitars.
Well made and packaged, reasonably long life, sound fantastic. Very expensive. When they finally got old, the dullness seemed to come on very fast.
By John C.
Uh Oh
October 21, 2013
Definitely the nicest sounding and playing acoustic string I have used to date. I have tried numerous brands over 40 plus years and unfortunately, these are also the most expensive so far. These will have to be the ones for recording sessions so the coffee can goes back out for collections, lol. Thanks again Just Strings for a pleasing eye opener.
By Kenny B.
The Best Strings
October 22, 2012
I've played guitar for 40 years, and these are the best acoustic guitar strings I've ever used - period. The tone is incredible, and the longevity is amazing. The only drawback is the price, which is why I no longer use them...
By Jay S.
My favorite string to date...
September 3, 2011
Even more resonant bass than the Markleys if just a little less, well, pliable -- but simply gorgeous tone, harmonics and clarity. Worth the extra expense in my opinion. Bring out the absolute best in my DN3.
By Thomas H.
June 17, 2011
I have never gone wrong with a Tomastik-Infeld string. These were the first acoustic strings I have purchased for a new guitar and wanted to be sure I got something I could reliably trust to give me the goods without the hype.
By tokiado@hotmail c.
spectrum bronze round wound medium light
December 17, 2010
Always impressed with the quality & performance.
By Che P.
Great Strings
October 29, 2010
I use them on a big 17" jazz box and they sound excellent, with great definition high to low and no muddiness whatsoever. Best of all, they give this guitar a much more acoustic sound than nickel strings, which is what I was hoping.
By steven
Thomastik Spectrum
August 17, 2010
After trying numerous other strings on a Martin HD28VS the two best were Newtone 80/20 Master Class and these Thomastik Spectrums. I think the Spectrums are the better of the two for both the sound tones
and ease of playability. The Newtones in the same gauge feel heavier and stiffer.
By Lon O.
Thomastik_Infeld Acoustic Guitar Strings
July 14, 2010
After testing 6-8 different brands of strings, I settled on Thomastiks for all three of my acoustic guitars, and I've used them exclusively for more than 5 years.
By chuck z.
Thomastik Spectrum Bronze
December 29, 2009
Great strings, bright but not muddy!
Adds sparkle to all of my acoustics.
Thanks JustStrings for your great service.
By tommy b.
thomastik-infeld medium light. .o12-.054
November 7, 2009






1st E

Plain Steel



2nd B

Plain Steel



3rd G

Bronze Round Wound



4th D

Bronze Round Wound



5th A

Bronze Round Wound



6th E

Bronze Round Wound




Spectrum Bronze Acoustic Series

characteristics: clear, balanced tone, ideal for recording sessions

"At last, the ultimate acoustic guitar string for recording, SPECTRUM BRONZE Series. You'll hear and feel the difference in the toughest situations from studio to stage. The treble strings are plain silver steel, the wound strings have a highly polished bronze covering. Deep basses, superb midrange and ultra clear highs, give extra power for those "intense" moments. SPECTRUM BRONZE Series deliver all this, … and more!!

The ultimate bronze round wound acoustic string! The Spectrum Bronze Series is specially designed for the demands of professional recording, yet is also unsurpassed in live performance situations. A unique bronze formula, combined with Thomastik-Infeld's mastery of mechanical filtering with their silk inlay technology, gives a full warm tone, with a sparkling clarity that lets you cut through a dense-sound mix. Playing feel is very balanced, and they are surprisingly long lasting.



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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