Thomastik-Infeld viola d`Amore … Thomastik-Infeld viola d`Amore resonance A` Item No. 721 Manufacturer Thomastik-Infeld Thomastik-Infeld viola d`Amore … Thomastik-Infeld viola d'Amore resonance A` × Thomastik-Infeld viola d`Amore resonance A`