Set with synthetic core and E-string stainless steel, with strings E I, A II, D III, G IV. The ball ends are made of titanal and are removable. The Thomastik Vision Titanium strings have a pure focused tone, and are the choice of solists. The string surface is highly polished. Thomastik no. VIT100 (incl. VIT01, VIT02, VIT03, VIT04).