Infeld Red Violin strings are wound on an 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. Infeld Red strings are designed to create a powerful, warm and expansive tone. These strings are excellent for soloists. The E string has a removable ball so that it can be loop or ball end. The A,D and G are all ball end. The E is Tin Plated, the A and D are Hydronalium and the G is Silver.