Founded in Vienna in 1919, Thomastik-Infeld is an Austrian manufacturer specialising in musical instrument strings and bow rosin. Its strings are developed and manufactured in Vienna, combining specialist craftsmanship with materials research, acoustics and precision engineering.

The range includes strings for violin, viola, cello, double bass, acoustic and electric guitar, jazz guitar and bass guitar, as well as folk instruments including mandolin, banjo, oud, pipa, erhu and cavaquinho. Well-known lines include Dominant, Spirocore, Vision and Peter Infeld, serving musicians from dedicated amateurs to professionals.

The company also manufactures bow rosin and offers a small range of branded T-shirts and tote bags through its official webshop. Manufacturing origins for the merchandise have not been verified; the Vienna production claim applies to its specialist musical strings and rosin.