The Thomastik-Infeld Rondo Gold Violin String Set includes 2 carbon steel E strings to optimize performance—one is tin-plated and the other is gold-plated. This set also includes an aluminum wound synthetic core A string and silver wound synthetic core D and G strings. The Rondo Gold set is warm, shiny, and precise and is warmly recommended for a golden sound. Trusted and loved by professional violinists, Rondo Gold strings offer unique tonal intensity and vast dynamic range. All Thomastik-Infeld products are proudly made in Austria, where we have been crafting strings since 1919.