Tonica Viola String Set 1/4 - 1/8Manufacture Description The sheep gut core of the Passione Solo strings is manufactured, wound and polished in the traditional way, by hand. soloistic tone with strong power and brilliance extended range of dynamics and tone colors very powerful and brilliant sound with great projection Significantly reduced playing in time: Passione strings are immediately playable other than traditional gut strings. very easy response E String Options Aluminum Loop