TH-15 Thomastik Infeld Superflexible violin string set 4/4 medium TH-8 Thomastik Infeld Superflexible violin string E-1 4/4 medium TH-14W Thomastik Infeld Superflexible violin string G-4 4/4 light TH-9ST Thomastik Infeld Superflexible violin string E-1 4/4 heavy TH-12ST Thomastik Infeld Superflexible violin string D-3 4/4 heavy TH-16ST Thomastik Infeld Superflexible violin string G-4 4/4 heavy