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Thomastik-Infeld is an Austrian company founded in 1919, located in Vienna developing and producing strings and rosins for bowed and fretted string instruments.

The company still makes "Dominant" strings, one of the earliest brands of perlon string, now considered a standard for comparison to other synthetic string sets. Other string brands from the company include:

  • Vision
  • Spirocore
  • Versum
  • Superflexible
  • Belcanto
  • Infeld (Red and Blue)
  • Prazision
  • Alphayue
  • Peter Infeld


In 1919, Dr. Franz Thomastik, a violin maker, and Otto Infeld, a civil engineer, decided to found a company. They started manufacturing steel strings.

In those years, the conventional gut string was challenged by another kind of string type; Thomastik-Infeld offered this type of string, making the brand very popular for virtuosi across the world.

The company was run by Peter Infeld from 1994 until his death on April 15, 2009. He was 67 years old. The company is now run by Zdenka Infeld.

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