Thomastik-Infeld Red strings: wound on in advanced synthetic core, the Infeld string system is designed to cover the entire tonal spectrum, enabling players to achieve string-by-string tonal preferences without the headaches of uneven string-to-string tensions. Infield Red strings are designed to create a powerful, warm and expansive tone. These strings are excellent for soloists.
https://www.thomastik-infeld.com/pageflips/catalog/24/