The F Vision (fa) string by Thomastik-Infeld is for 6-string 4/4 electric violins. You can use it with the Thomastik Vision Strings Set (E-A-D-G) and the C Vision string (do).
This F string is in silver over synthetic core, with ball-end and a medium tension. The diameter of this F string is wider than the other strings. But in comparison to other F strings, the Vision F string is thinner and so offers an excellent sound reactivity. The Vision strings offer a clear, focused and brilliant tone to electric or acoustic violins.
Vision Strings are specifically designed to suit the needs of professional and advanced violinists. With their synthetic core, they settle in quickly to your violin giving it that special durable sound.