THPI-100 Thomastik Infeld Peter Infeld violin string set 4/4 THPI-01SN Thomastik Infeld Peter Infeld violin string E-1 4/4 THPI-01AU Thomastik Infeld Peter Infeld violin string E-1 4/4 THPI-01PT Thomastik Infeld Peter Infeld violin string E-1 4/4 THPI-02 Thomastik Infeld Peter Infeld violin string A-2 4/4 THPI-03 Thomastik Infeld Peter Infeld violin string D-3 4/4 THPI-03A Thomastik Infeld Peter Infeld violin string D-3 4/4 THPI-04 Thomastik Infeld Peter Infeld violin string G-4 4/4