Thomastik Vision Titanium Solo Violin Strings A, Titanium 4/4 Size Vision Titanium Solo Violin Strings A, Titanium 4/4 Size Synthetic core (Titanium wound E string) strings produce rich, complex tone Settles in within 2-4 hours, unparalleled tuning stability, exceptional playability Vision strings are designed for advanced violinists, Vision Titanium are for soloists Vision Titanium Orchestra are lower tension, have a richer and warmer sound, and a feel and tone quite similar to gut core strings Synthetic core (Titanium wound E string) strings produce rich, complex tone