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. Vision Titanium Orchestra strings are targeted to orchestra players as well as chamber music players. The strings have been developed to replace gut strings and can be mixed and matched with synthetic core strings and pure gut strings. Ball ends are made of Titanate and the surface is treated in a special way.Why are Thomastik-Infeld strings so unique? High standards are guaranteed by a team of highly specialized technicians constantly doing research in Thomastik-Infeld's own lab. Every string at Thomastik-Infeld is wound and checked by hand.