THRG-100 Thomastik Infeld Rondo Gold violin string set 4/4 THRG-01 Thomastik Infeld Rondo Gold violin string E-1 4/4 medium THRG-02 Thomastik Infeld Rondo Gold violin string A-2 4/4 medium THRG-03A Thomastik Infeld Rondo Gold violin string D-3 4/4 medium THRG-04 Thomastik Infeld Rondo Gold violin string G-4 4/4 medium THRG-01AU Thomastik Infeld Rondo Gold violin string E-1 4/4 medium