Thomastik-Infeld Spirocore … Thomastik-Infeld Spirocore violin SET, E-chrome Item No. S15A Manufacturer Thomastik-Infeld Thomastik-Infeld Spirocore … Thomastik-Infeld Spirocore violin SET, S8, S10, S12, S13 × Thomastik-Infeld Spirocore violin SET, E-chrome