viola string A-1 medium, steel core, chrome steel
viola string D-2 medium, steel core, titanium
viola string G-3 medium, steel core, silver
viola string C-4 medium, steel core, tungsten-silver
viola string A-1 thick, steel core, chrome steel
viola string D-2 thick, steel core, titanium
viola string G-3 thick, steel core, silver
viola string C-4 thick, steel core, tungsten-silver