The history of Thomastik-Infeld dates back to 1919. It was then that violin maker Dr. Franz Thomastik and civil engineer Otto Infeld co-founded the company and introduced the steel string that offered greater tonal quality and reliability than the traditional gut string. Over 90 years later, their continuing research and expert technicians keep the company on the leading edge of string innovation. We offer several lines of professional quality Thomastik-Infeld strings for acoustic guitar, electric guitar, jazz guitar and bass guitar. We also have their violin, upright double bass, mandolin and mandola strings.