VIT-100-O Thomastik Infeld Vision Titanium Orchestra violin string set 4/4 VIT-01-O Thomastik Infeld Vision Titanium Orchestra violin string E-1 4/4 VIT-02-O Thomastik Infeld Vision Titanium Orchestra violin string A-2 4/4 VIT-03-O Thomastik Infeld Vision Titanium Orchestra violin string D-3 4/4 VIT-04-O Thomastik Infeld Vision Titanium Orchestra violin string G-4 4/4